Ishiyama, Sumo Slammer

Ishiyama, Sumo Slammer costs {x} less to cast
for each card you own in exile.
Vigilance, trample
Whenever Ishiyama, Sumo Slammer blocks,
exile any number of permanents you control,
then gain that much life and put that many
+1/+1 counters on Ishiyama, Sumo Slammer.