Urza's Armor

If a source would deal damage to you, prevent 1 of that damage.

Lava Axe

Lava Axe deals 5 damage to target player or planeswalker.

Shivan Oasis enters tapped.
{T}: Add {R} or {G}.

Pyroclasm deals 2 damage to each creature.

Sudden Impact deals damage to target player equal to the number of cards in that player's hand.

Whenever a player casts a red spell, you may pay {1}. If you do, you gain 1 life.

Lightning Blast deals 4 damage to any target.

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)

Whenever a player casts a white spell, you may pay {1}. If you do, you gain 1 life.

Pyrotechnics deals 4 damage divided as you choose among any number of targets.