Eria, the Bloodied.

Double strike, ward — Discard a card.
Whenever a creature an opponent controls dies,
if Eria dealt damage to it this turn, it's controller
may pay life equal to its mana cost. If they don't,
or if the cost is equal to 0, it's controller discards
a card instead.
Whenever a creature you control dies, if it was attacking, you may pay 1 life. If you do, draw a
card.