Salazar Slytherin

Deathtouch, First strike
Sacrifice a creature: Put a purge counter on target
creature. Do this ability only once per turn. Then
if there are 3 or more creatures with purge
counters on them, transform Salazar Slytherin.
When Salazar Slytherin transforms, each
opponent sacrifices each creatures they control
with a purge counter.
"The power to make people fear you is the only power
you need"