Incidentally, exile effects like these are also excellent against Deathmist Raptor, which is another major player in Standard alongside Hangarback Walker
One of the big reasons why Sultai Mutate scored so low in so many categories is that the deck is built around a brand new mechanic that doesn't have any support from the past 25 years of Magic , which limits the number of good on-theme reprints and even keeps many of the most powerful mutate cards out of the deck since Wizards presumably wanted to save them for Ikoria proper
For example, you could be in either Undercity or Lost Mine of Phandelver, but not both
When the Room spell resolves, the corresponding door becomes unlocked as the Room enters
That prize goes to Circle of Protection: Artifacts
This deck might be a couple of elite two-drops away from being tier 1Strangleroot Geist is missed herebut dropping Xenagos should be one of the most powerful things youll be able to do in Standard for the next year and a half