Gyokko

Indestructible, hexproof

Backup 1 (When this creature enters the battlefield,
put a +1/+1 counter on target creature. If that’s
another creature, it gains the following abilities until
end of turn.)

Persist (When this creature dies, if it had no -1/-1
counters on it, return it to the battlefield under
its owner’s control with a -1/-1 counter on it.)