Detonate

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

Killer Bees

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

Forest

Craw Wurm

Winter Blast

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

Dragon Engine

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

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.

Mountain

Llanowar Elves

Shivan Dragon

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

Mana Vault

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

Birds of Paradise

Firebreathing

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

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.