Smolder, Master of Heat

X: Exile X target creatures you control and put a silver counter on each card exiled this way. If X is more than 9, gain half the value of X instead
-X: Return X cards with silver counters to the battlefield with haste. If X is more than 9, lose half the value of X instead
-15: All creatures you control gain +2/+2 and vigilance until end of turn. If you control more than 9 creatures, exile this card.