Grunn, the Lonely King

Kicker {3} (You may pay an additional {3} as you cast this spell.) If Grunn was kicked, it enters with five +1/+1 counters on it. Whenever Grunn attacks alone, double its power and toughness until end of turn.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6okhz2euw1pb1htpryz9ow.