Nova, the Spoiled One

Kicker {4}: Nova, the Spoiled One enters the battlefield with five +1/+1 counters on it.
When Nova, the Spoiled One attacks alone,
it’s power and toughness doubles and gains trample until end of turn.
When Nova, the Spoiled One attacks with another creature, it loses all +1/+1 counters and gains vigilance until end of turn.