There are a lot of creatures in Standard that get +1/+1 counters whenever you gain life, and these Historic decks look to capitalize on that while using the powerful green instant, Collected Company
Once it resolves, your subsequent creatures will keep getting buffed, so if this resolves around turn 3, there is a possibility that it will become almost impossible to deal with
Heres a step-by-step guide on how to successfully mutate one card onto another on MTG Arena: Step #1
One of them cracking not only the aforementioned barrier, but the earth, and the scale
Channel - , Discard Touch the Spirit Realm: Exile target artifact or creature
While you can get value from a dead Meloku that was killed with spot removal after you had spare mana he does nothing to give value through mass removal which can also be a pain