Rotting Abyss

Rotting Abyss enters the battlefield tapped
and doesn't untap during your untap step.
At the beginning of your precombat main phase, remove all charge counters from Rotting Abyss. If no counters were removed this way, put a charge counter on Rotting
Abyss. Otherwise, untap Rotting Abyss.
{t}: Add {b}{g}{c}.