Leariah, Barbarian Queen

Whenever 1 or more creatures you control attack
the same player, those creatures get +1/+0 until
the end of the turn
Whenever 3 or more creatures you control attack
the same player create a 1/1 Green Elf Warrior creature token that is tapped and attacking
Whenever 5 or more creatures you control attack
the same player those creature get +2/+0 and
Trample until the end of the turn