Scourgefire Artilleryrats

Defender, wither
At the beginning of your upkeep, remove all shell counters from Scourgefire Artilleryrats. Then,
for each counter removed this way, Scourgefire Artilleryrats deals 2 damage to any target. If a creature dies this way, put two shell counters on Scourgefire Artilleryrats.
{b}{r}, Pay 3 life: Put a shell counter on
Scourgefire Artilleryrats.