Nightsky Mimic

Whenever you cast a spell that’s both white and black, Nightsky Mimic has base power and toughness 4/4 until end of turn and gains flying until end of turn.

Riverfall Mimic

Whenever you cast a spell that’s both blue and red, Riverfall Mimic has base power and toughness 3/3 until end of turn and can’t be blocked this turn.

Woodlurker Mimic

Whenever you cast a spell that’s both black and green, Woodlurker Mimic has base power and toughness 4/5 until end of turn and gains wither until end of turn. (It deals damage to creatures in the form of -1/-1 counters.)

Battlegate Mimic

Whenever you cast a spell that’s both red and white, Battlegate Mimic has base power and toughness 4/2 until end of turn and gains first strike until end of turn.

Puncture Bolt

Puncture Bolt deals 1 damage to target creature. Put a -1/-1 counter on that creature.

Helm of the Ghastlord

Enchant creature
As long as enchanted creature is blue, it gets +1/+1 and has “Whenever this creature deals damage to an opponent, draw a card.”
As long as enchanted creature is black, it gets +1/+1 and has “Whenever this creature deals damage to an opponent, that player discards a card.”

Revelsong Horn

, , Tap an untapped creature you control: Target creature gets +1/+1 until end of turn.

Dire Undercurrents

Whenever a blue creature enters the battlefield under your control, you may have target player draw a card.
Whenever a black creature enters the battlefield under your control, you may have target player discard a card.

Shard Volley

As an additional cost to cast this spell, sacrifice a land.
Shard Volley deals 3 damage to any target.

Coordinated Barrage

Choose a creature type. Coordinated Barrage deals damage to target attacking or blocking creature equal to the number of permanents you control of the chosen type.

Forfend

Prevent all damage that would be dealt to creatures this turn.

Twinning Glass

, : You may cast a spell from your hand without paying its mana cost if it has the same name as a spell that was cast this turn.

Broken Ambitions

Counter target spell unless its controller pays . Clash with an opponent. If you win, that spell’s controller mills four cards. (Each clashing player reveals the top card of their library, then puts that card on the top or bottom. A player wins if their card had a higher converted mana cost.)

Heat Shimmer

Create a token that’s a copy of target creature, except it has haste and “At the beginning of the end step, exile this permanent.”

Scattering Stroke

Counter target spell. Clash with an opponent. If you win, at the beginning of your next main phase, you may add an amount of equal to that spell’s converted mana cost. (Each clashing player reveals the top card of their library, then puts that card on the top or bottom. A player wins if their card had a higher converted mana cost.)

Evacuation

Return all creatures to their owners’ hands.

Sword of the Meek

Equipped creature gets +1/+2.
Equip
Whenever a 1/1 creature enters the battlefield under your control, you may return Sword of the Meek from your graveyard to the battlefield, then attach it to that creature.

Chronomantic Escape

Until your next turn, creatures can’t attack you. Exile Chronomantic Escape with three time counters on it.
Suspend 3— (Rather than cast this card from your hand, you may pay and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost.)

Virulent Sliver

All Sliver creatures have poisonous 1. (Whenever a Sliver deals combat damage to a player, that player gets a poison counter. A player with ten or more poison counters loses the game.)

Jötun Grunt

Cumulative upkeep—Put two cards from a single graveyard on the bottom of their owner’s library. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)