The Heavenly Kings

When The Heavenly Kings attacks, you may sacrifice a creature. If you do, you gain life equal to that creature's power, and The Heavenly Kings gets +X/+X until end of turn, where X is that creature's toughness.

At the beginning of your upkeep, you may pay {w/u}{r/g}{1}. If you do, The Heavenly Kings gain lifelink and trample until end of turn.

Whenever a creature you control attacks. You may, draw a card and a target opponent discards a card.