Yahenni's Expertise

All creatures get -3/-3 until end of turn.
You may cast a spell with mana value 3 or less from your hand without paying its mana cost.

Myr Moonvessel

Akki Rockspeaker

Coal Stoker

When Coal Stoker enters, if you cast it from your hand, add {R}{R}{R}.

Priest of Gix

When Priest of Gix enters, add {B}{B}{B}.

Burnt Offering

As an additional cost to cast this spell, sacrifice a creature.
Add X mana in any combination of {B} and/or {R}, where X is the sacrificed creature's mana value.

Priest of Urabrask

When Priest of Urabrask enters, add {R}{R}{R}.

Heartless Summoning

Creature spells you cast cost {2} less to cast.
Creatures you control get -1/-1.

Stadium Vendors

When Stadium Vendors enters, choose a player. That player adds two mana of any one color they choose.

Inner Fire

Garna, the Bloodflame

Flash
When Garna, the Bloodflame enters, return to your hand all creature cards in your graveyard that were put there from anywhere this turn.
Other creatures you control have haste.