Jetmir, Nexus of Revels {1}{R}{G}{W}
Legendary Creature — Cat Demon
Creatures you control get +1/+0 and have vigilance as long as you control three or more creatures.
Creatures you control also get +1/+0 and have trample as long as you control six or more creatures.
Creatures you control also get +1/+0 and have double strike as long as you control nine or more creatures.
5/4