Ame, The Shadow Bringer

When Ame deals lethal damage to another creature, create a copy of that creature under your control only it is also a shadow.

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.