Manta Riders

{U}: Manta Riders gains flying until end of turn.

Null Brooch

{2}, {T}, Discard your hand: Counter target noncreature spell.

Keeper of the Mind

{U}, {T}: Choose target opponent who has at least two more cards in hand than you do as you activate this ability. Draw a card.

Swamp

Counterspell

Thalakos Scout

Shadow (This creature can block or be blocked by only creatures with shadow.)
Discard a card: Return Thalakos Scout to its owner's hand.

Rootwater Hunter

{T}: Rootwater Hunter deals 1 damage to any target.

Dark Banishing

Destroy target nonblack creature. It can't be regenerated.

Vampire Hounds

Discard a creature card: Vampire Hounds gets +2/+2 until end of turn.

Merfolk Looter

Mind Maggots

When Mind Maggots enters, discard any number of creature cards. For each card discarded this way, put two +1/+1 counters on Mind Maggots.

Necrologia

Cast this spell only during your end step.
As an additional cost to cast this spell, pay X life.
Draw X cards.

Skyshroud Vampire

Flying
Discard a creature card: Skyshroud Vampire gets +2/+2 until end of turn.

Mindless Automaton

Mindless Automaton enters with two +1/+1 counters on it.
{1}, Discard a card: Put a +1/+1 counter on Mindless Automaton.
Remove two +1/+1 counters from Mindless Automaton: Draw a card.

Capsize

Buyback {3} (You may pay an additional {3} as you cast this spell. If you do, put this card into your hand as it resolves.)
Return target permanent to its owner's hand.

Island

Treasure Trove

Oath of Scholars

At the beginning of each player's upkeep, that player chooses target player who has more cards in hand than they do and is their opponent. The first player may discard their hand and draw three cards.

Dark Ritual

Diabolic Edict

Target player sacrifices a creature of their choice.

Mana Leak

Counter target spell unless its controller pays {3}.

Forbid

Buyback—Discard two cards. (You may discard two cards in addition to any other costs as you cast this spell. If you do, put this card into your hand as it resolves.)
Counter target spell.