Skulls of the Red Keep

Whenever an opponent takes damage, put a
charge counter on Skulls of the Red Keep.
Remove six charge counters from Skulls of
the Red Keep: Choose any number of players.
Each player chosen this way creates a 4/4 red
Dragon creature token with flying.
"There was Ghiscar and Valryon, Vermithrax,
Archonel, Meraxes, Vhagar, and Balerion the Dread,
whose fire forged the Seven Kingdoms into one."