Morrius

Flash, Haste, First Strike
Morbid — At the beginning of each end step, if a creature died this turn, choose two creature cards
in graveyards. Create a token that's a copy
of one of those creatures, except with base power
and toughness of the other creature. (Treat * as 0)
{t}: Create a colorless Treasure artifact token
with: "{t}, sacrifice this artifact: Add one mana of
any color."