Mogg Maniac

Whenever this creature is dealt damage, it deals that much damage to target opponent or planeswalker.

Earthquake

Earthquake deals X damage to each creature without flying and each player.

Starstorm deals X damage to each creature.
Cycling {3} ({3}, Discard this card: Draw a card.)

{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.

As an additional cost to cast this spell, discard X cards.
Firestorm deals X damage to each of X targets.