Taiga

Channel

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

Birds of Paradise

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Forest

Llanowar Elves

Mountain

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.

Sol Ring

Black Vise

As Black Vise enters, choose an opponent.
At the beginning of the chosen player's upkeep, Black Vise deals X damage to that player, where X is the number of cards in their hand minus 4.

Wild Growth

Enchant land
Whenever enchanted land is tapped for mana, its controller adds an additional {G}.