Death Kiss (675) [Commander Legends: Battle for Baldur's Gate]

Whenever a creature an opponent controls attacks one of your opponents, double its power until end of turn. {X}{X}{R}: Monstrosity X. (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.) When this creature becomes monstrous, goad up to X target creatures your opponents control.