Fling

As an additional cost to cast this spell, sacrifice a creature.
Fling deals damage equal to the sacrificed creature's power to any target.

Burning-Tree Emissary

When Burning-Tree Emissary enters, add {R}{G}.

Mountain

Llanowar Tribe

Elvish Mystic

Colossification

Enchant creature
When Colossification enters, tap enchanted creature.
Enchanted creature gets +20/+20.

Thud

As an additional cost to cast this spell, sacrifice a creature.
Thud deals damage equal to the sacrificed creature's power to any target.

Forest

Soul's Fire

Target creature you control deals damage equal to its power to any target.

Llanowar Elves

Karametra's Acolyte

{T}: Add an amount of {G} equal to your devotion to green. (Each {G} in the mana costs of permanents you control counts toward your devotion to green.)