This spell can't be countered.

Flying

Whenever you draw a card, Niv-Mizzet deals 1 damage to any target.

Whenever a player casts an instant or sorcery spell, you draw a card.

Flying

When this creature dies, you may destroy target creature with mana value 3 or less.

This creature enters with four +1/+1 counters on it.

This creature attacks each combat if able.

If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage and remove a +1/+1 counter from it.

Tap an untapped creature you control: Tap target artifact, creature, or land.

: Each creature you control named Pack Mastiff gets +1/+0 until end of turn.

Whenever you or a permanent you control becomes the target of a spell or ability an opponent controls, counter that spell or ability unless that player pays 4 life.

Whenever you copy a spell, up to one target opponent may also copy that spell. They may choose new targets for that copy.

Flying, haste

: This creature gets +2/+0 until end of turn.

Escape—, Exile three other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)

This creature escapes with a +1/+1 counter on it.

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

At the beginning of your upkeep, create a 1/1 green Phyrexian Insect creature token with infect for each poison counter your opponents have.

Play with Fire deals 2 damage to any target. If a player is dealt damage this way, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Scry 2, then draw a card. (To scry 2, look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)

Enchant creature

Enchanted creature gets +7/+7 and has trample.

: This creature deals 1 damage to target player.

Put target creature card from a graveyard onto the battlefield under your control. You lose life equal to its mana value.

This creature can't attack or block unless an opponent has eight or more cards in their graveyard.

, : Target player mills two cards. (They put the top two cards of their library into their graveyard.)

When this creature enters, you may have target creature get +X/+X until end of turn, where X is this creature's power.

Eternalize (, Exile this card from your graveyard: Create a token that's a copy of it, except it's a 4/4 black Zombie Jackal Wizard with no mana cost. Eternalize only as a sorcery.)

, Remove X +1/+1 counters from among creatures you control: Target creature gets -X/-X until end of turn.

Whenever you sacrifice a creature, you may return target creature card with lesser mana value from your graveyard to the battlefield tapped. Do this only once each turn.

Flying, trample

When Roalesk enters, put two +1/+1 counters on another target creature you control.

When Roalesk dies, proliferate, then proliferate again. (Choose any number of permanents and/or players, then give each another counter of each kind already there. Then do it again.)

Casualty 1 (As you cast this spell, you may sacrifice a creature with power 1 or greater. When you do, copy this spell and you may choose a new target for the copy.)

Tap target creature. It doesn't untap during its controller's next untap step.

Draw a card.

Target attacking creature gets +3/+3 and gains trample until end of turn.

Return target exiled card with flashback you own to your hand.

Sacred Fire deals 2 damage to any target and you gain 2 life.

Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Target creature gets +2/+2 until end of turn. Untap that creature.

As long as you control an artifact, this creature gets +2/+0 and has trample. (It can deal excess combat damage to the player or planeswalker it's attacking.)

Enchant creature

Enchanted creature gets +2/+2 and is goaded. (It attacks each combat if able and attacks a player other than you if able.)

Whenever enchanted creature attacks, you create a Treasure token. (It's an artifact with ", Sacrifice this token: Add one mana of any color.")

This creature can't block.

Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

When this artifact enters, scry 2.

Whenever another artifact you control with mana value 3 or greater enters, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control."

: This creature gets +1/-1 until end of turn.

Eternalize—, Discard a card. (, Discard a card, Exile this card from your graveyard: Create a token that's a copy of it, except it's a 4/4 black Zombie Snake Warrior with no mana cost. Eternalize only as a sorcery.)

Each Skeleton you control has trample, attacks each combat if able, and gets +X/+0, where X is the number of other Skeletons you control.

At the beginning of your end step, create a tapped 1/1 black Skeleton creature token. If a creature died this turn, create two of those tokens instead.

Whenever this creature deals damage to an opponent, that player discards a card at random. If the player does, they draw a card.

Whenever this creature enters or attacks, put a slime counter on up to one other target creature.

Non-Horror creatures with slime counters on them lose all abilities and have base power and toughness 2/2.

Flash

Lifelink

When this creature enters, exile up to one other target creature. That creature's controller gains life equal to its power.

Evoke—Exile a white card from your hand.

Flying

When this creature enters, it deals damage to any target equal to the number of Mountains you control.

Flying, trample

Spellheart Chimera's power is equal to the number of instant and sorcery cards in your graveyard.

Landfall — Whenever a land you control enters, create a 1/1 green Saproling creature token.

Squelching Leeches's power and toughness are each equal to the number of Swamps you control.

, Discard a card: Tap target creature.

Whenever one or more cards leave your graveyard, scry 1.

Flying, first strike

Megamorph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)

When this creature is turned face up, put a +1/+1 counter on each other Dragon creature you control.

Choose target creature you control. Put a +1/+1 counter on it for each creature in your party. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.)

Flash

Flying

When this creature enters, choose up to one target creature spell or planeswalker spell. Its owner puts it on their choice of the top or bottom of their library.

Evoke—Exile a blue card from your hand.

Target creature gets +1/+0 and gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Investigate. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")

Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control. It can attack and no matter when it came under your control.)

Equip (: Attach to target creature you control. Equip only as a sorcery.)

Surveil 5. (Look at the top five cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Whenever you cast an instant or sorcery spell, create a 2/2 blue Drake creature token with flying.

Whenever this creature or another Ally you control enters, you may have Allies you control gain lifelink until end of turn, and you may put a +1/+1 counter on this creature.

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)

Sliver spells you cast have cascade.

Defender

This creature enters with four ice counters on it.

Whenever you cast an instant or sorcery spell, remove an ice counter from this creature. Then if it has no ice counters on it, transform it.