Bumi, Patient Prisoner

Bumi enters with three cage counters on it and
has base power and toughness 1/1 as long as it has any cage counters on it.

At the beginning of your upkeep, flip a coin.
If you win the flip, remove a cage counter
from Bumi.

{1}{r}, {t}: Destroy target artifact. This ability costs {1}more to activate for each cage counter
on Bumi.