Go-Isshin, the Fallen

Hexproof, double strike
Undying (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.)
At the start of combat on your turn, choose one:
•Go-Isshin, the Fallen gains toxic 2 until end of turn.
•If Go-Isshin, the Fallen attacks this turn and isn't blocked, it inflicts damage equal to its power to any target.

'Witness perfection. Witness compleation.'