Forest

Channel

Until end of turn, any time you could activate a mana ability, you may pay 1 life. If you do, add {C}.

Brass Man

Brass Man doesn't untap during your untap step.
At the beginning of your upkeep, you may pay {1}. If you do, untap Brass Man.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Llanowar Elves

Sol Ring

Mountain

Kird Ape

Kird Ape gets +1/+2 as long as you control a Forest.

Scryb Sprites

Birds of Paradise

Fireball

This spell costs {1} more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Disintegrate

Disintegrate deals X damage to any target. If it's a creature, it can't be regenerated this turn, and if it would die this turn, exile it instead.