Semaj and Cosmo

When Semaj and Cosmo, Best Buds enters the battlefield and at the beginning of your upkeep, you may create Cosmo, a legendary 1/1 red Hamster creature token with trample and haste. [+1]: Put three +1/+1 counters on up to one target creature with trample or haste. [-2]: Sacrifice a creature. When you do, Semaj & Cosmo, Best Buds deals X damage to any target, where X is that creature’s power. If the sacrificed creature was a Hamster, draw X cards. Semaj & Cosmo, Best Buds can be your commander.