Lavaright Shaman

Elementals you control get +1/+0
Whenever a Elemental you control attacks, you may pay {1} and discard a card, if you do, that attacking creature gets +X/+X, where X is the discarded cards converted mana cost. Sacrifice that creature at the beginning of your next end step.
Aion's Shamans were always looking to find new and creative ways to set towns on fire