xyroctorg, father nightmare

flying, trample, intimidate,
whenever this creature deals combat damage to a player, you may sacrifice three permanents. if you
do, put 3 +1/+1 counters on xyroctorg, father
nightmare and you lose 5 life.
whenever a player deals combat damage to you, if xyroctorg, father nightmare has a +1/+1 counter
on it, that players life total becomes 1.