Zamasu

Flying, Indestructible.

When Zamasu attacks, target opponent sacrifices a creature with the lowest converted mana cost among creatures they control.
At the beginning of your upkeep,
if you have less than half your starting life total and you both own and control Zamasu and Goku Black exile them and meld them into Fused Zamasu
You may cast Zamasu from graveyard or exile.