Aavalos, King Thief

Shroud, can't block and can't be blocked
Whenever Aavalos deals damage, put that many
coin counters on him.
Whenever a creature an opponent controls dies,
put X coin counters on Aavalos where X is that
creature's toughness.
Aavalos gets +1 to d20 rolls per 2 coin counters.
{t}, remove X coin counters: roll X d20. For each
success, Aavalos deals 1 damage to target creature.
"Anything can be killed... at the right price."