Modern Horizons

Sliver creatures you control have "Whenever this creature is dealt damage, it deals that much damage to target player or planeswalker."

As long as you had another creature enter the battlefield under your control this turn, Bellowing Elk has trample and indestructible.

Sliver creatures you control have "Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."

Whenever another snow permanent enters the battlefield under your control, you may have target player mill two cards.

{4}, {T}: Create a 2/2 colorless Shapeshifter creature token with changeling. (It has every creature type.)

Counter target spell. Fateful hour — If you have 5 or less life, draw a card.

{T}: Add {C}. {1}, {T}: Add one mana of any color. {4}, {T}, Sacrifice Cave of Temptation: Put two +1/+1 counters on target creature. Activate only...

Return target card from your graveyard to your hand.

{3}{G}{G}, Exile Mother Bear from your graveyard: Create two 2/2 green Bear creature tokens. Activate this ability only any time you could cast a s...

Return all artifacts to their owners' hands. Cycling {2} ({2}, Discard this card: Draw a card.)

Other Cats you control get +2/+1.

Counter target creature spell. Draw a card.

Ninjutsu {3}{B} ({3}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

{S}: Frostwalla gets +2/+2 until end of turn. Activate only once each turn. ({S} can be paid with one mana from a snow source.)

Flying Whenever you draw a card, put a +1/+1 counter on Oneirophage.

Trample, haste At the beginning of the end step, return Viashino Sandsprinter to its owner's hand. (Return it only if it's on the battlefield.) C...

Changeling (This card is every creature type.) Whenever you or a permanent you control becomes the target of a spell or ability an opponent control...

Scry 2, then draw a card. Flashback {4}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Sliver creatures you control have first strike.

Scry 2, then draw a card. Flashback {4}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

If it's not your turn, you may exile a white card from your hand rather than pay this spell's mana cost. Flash Creatures you control get +1/+1.

Choose creature or land. Reveal the top four cards of your library. Put all cards of the chosen type revealed this way into your hand and the rest ...

Target creature you control gains protection from the color of your choice until end of turn. Draw a card.

Whenever Warteye Witch or another creature you control dies, scry 1.