Sidisi, Brood Tyrant

Whenever Sidisi, Brood Tyrant enters the battlefield or attacks, mill three cards.
Whenever one or more creature cards are put into your graveyard from your library, create a 2/2 black Zombie creature token.

Caress of Phyrexia

Target player draws three cards, loses 3 life, and gets three poison counters.

Constricting Sliver

Sliver creatures you control have “When this creature enters the battlefield, you may exile target creature an opponent controls until this creature leaves the battlefield.”

Krenko, Mob Boss

: Create X 1/1 red Goblin creature tokens, where X is the number of Goblins you control.

Tyrant of Kher Ridges

Flying
When Tyrant of Kher Ridges enters the battlefield, it deals 4 damage to any target.
: Tyrant of Kher Ridges gets +1/+0 until end of turn.

Mind’s Eye

Whenever an opponent draws a card, you may pay . If you do, draw a card.

Acidic Slime

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
When Acidic Slime enters the battlefield, destroy target artifact, enchantment, or land.

Aether Vial

At the beginning of your upkeep, you may put a charge counter on Aether Vial.
: You may put a creature card with mana value equal to the number of charge counters on Aether Vial from your hand onto the battlefield.

Dack’s Duplicate

You may have Dack’s Duplicate enter the battlefield as a copy of any creature on the battlefield, except it has haste and dethrone. (Whenever it attacks the player with the most life or tied for most life, put a +1/+1 counter on it.)

Aether Vial

At the beginning of your upkeep, you may put a charge counter on Aether Vial.
: You may put a creature card with mana value equal to the number of charge counters on Aether Vial from your hand onto the battlefield.

Prized Amalgam

Whenever a creature enters the battlefield, if it entered from your graveyard or you cast it from your graveyard, return Prized Amalgam from your graveyard to the battlefield tapped at the beginning of the next end step.

Consuming Aberration

Consuming Aberration’s power and toughness are each equal to the number of cards in your opponents’ graveyards.
Whenever you cast a spell, each opponent reveals cards from the top of their library until they reveal a land card, then puts those cards into their graveyard.

Vorinclex, Voice of Hunger

Trample
Whenever you tap a land for mana, add one mana of any type that land produced.
Whenever an opponent taps a land for mana, that land doesn’t untap during its controller’s next untap step.

Slayers’ Stronghold

: Add .
, : Target creature gets +2/+0 and gains vigilance and haste until end of turn.

Stormtide Leviathan

Islandwalk (This creature can’t be blocked as long as defending player controls an Island.)
All lands are Islands in addition to their other types.
Creatures without flying or islandwalk can’t attack.

Horizon Scholar

Flying
When Horizon Scholar enters the battlefield, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Acidic Slime

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
When Acidic Slime enters the battlefield, destroy target artifact, enchantment, or land.

Acidic Slime

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
When Acidic Slime enters the battlefield, destroy target artifact, enchantment, or land.

Barricade Breaker

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you’re done activating mana abilities pays for .)
Barricade Breaker attacks each combat if able.

Gatekeeper of Malakir

Kicker (You may pay an additional as you cast this spell.)
When Gatekeeper of Malakir enters the battlefield, if it was kicked, target player sacrifices a creature.

Hell’s Thunder

Flying, haste
At the beginning of the end step, sacrifice Hell’s Thunder.
Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Acidic Slime

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
When Acidic Slime enters the battlefield, destroy target artifact, enchantment, or land.