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.

Winter Blast

Tap X target creatures. Winter Blast deals 2 damage to each of those creatures with flying.

Llanowar Elves

Craw Wurm

Birds of Paradise

Stream of Life

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.

Mana Vault

Mana Vault doesn't untap during your untap step.
At the beginning of your upkeep, you may pay {4}. If you do, untap Mana Vault.
At the beginning of your draw step, if Mana Vault is tapped, it deals 1 damage to you.
{T}: Add {C}{C}{C}.

Dragon Engine

{2}: Dragon Engine gets +1/+0 until end of turn.

Mountain

Killer Bees

Flying
{G}: Killer Bees gets +1/+1 until end of turn.

Shivan Dragon

Flying
{R}: This creature gets +1/+0 until end of turn.

Firebreathing

Enchant creature
{R}: Enchanted creature gets +1/+0 until end of turn.

Detonate

Destroy target artifact with mana value X. It can't be regenerated. Detonate deals X damage to that artifact's controller.