Meltdown

Meltdown does not untap unless its controller
pays {2}{b/r}{b/r}.
•{x}{r}{r}{t}, X number of creatures target player controls get 3 Meltdown counters
•{3}{b}{b}{t}, Target player gets 3 Meltdown
counters.
At the end of targets turn, they may remove a Meltdown counter from themselves and/or
creature. While Meltdown counters are stacked, afflicted target takes double damage.