Xanathar

Hexproof
At the beginning of each end step if a Goldfish
you controlled died this turn, sacrifice any
number of creatures. Xanathar deals damage to
each creature you don't control equal to the
number of creatures sacrificed.
At the beginning of your upkeep you may pay {u/r}{u/r}. If you do, create a 0/1 Goldfish creature
token with defender.