Mountain

Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Divination

Breath Weapon

Breath Weapon deals 2 damage to each non-Dragon creature.

Guttersnipe

Whenever you cast an instant or sorcery spell, Guttersnipe deals 2 damage to each opponent.

Bloodwater Entity

Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When Bloodwater Entity enters, you may put target instant or sorcery card from your graveyard on top of your library.

Blisterspit Gremlin

{1}, {T}: Blisterspit Gremlin deals 1 damage to each opponent.
Whenever you cast a noncreature spell, untap Blisterspit Gremlin.

Arc Lightning

Arc Lightning deals 3 damage divided as you choose among one, two, or three targets.

Island

Lightning Strike

Lightning Strike deals 3 damage to any target.

Antagonize

Target creature gets +4/+3 until end of turn.