Thumper

Thumper enters the battlefield with {x} +1/+1 counters on it.
Remove a +1/+1 counter from thumper:
Add {c}{c}. Spend this mana only to cast
Makers.
{t}: Put a +1/+1 counter on Thumper.
When he threw the latch, the thumper would begin its summons. Across the sand, a giant worm would hear and come to the drumming.