The Undertaker, Phenom

Deathtouch, trample, haste
Whenever The Undertaker, Phenom attacks, it
gains indestructible until end of turn.
Whenever a creature dealt damage by The Undertaker, Phenom dies, put a +1/+1 counter
on The Undertaker, Phenom. Then, if it has 21
+1/+1 counters, sacrifice it.