Walon Vau, Brutal Instructor

Persist (When this creature is put into a graveyard, if it had no -1/-1 counters on it,
return it to play under your control with a
-1/-1 counter on it.)

All Soldiers you control gain Persist.

{b}{4},{t}: Create an Explosive Token. This Ability costs {1} less for each other Elite Soldier you control.