Nethroi, Apex Of Death can trigger this effect multiple times since green, black, and white generally have the cheapest mutate creatures, and Nethroi's ability triggers whenever it mutates, not just when it's cast
If Betrayer's Bargain resolves, its effect causes the creature to be exiled any time it would die that turn, not just if it would die as a result of damage dealt by Betrayer's Bargain
Return the exiled cards to the battlefield under their owners' control at the beginning of the next end step
tomorrow it likely means more Marvel sets are transformed into this alternate universe that works exactly the same but we're all called something else. The good
It has Flash, so it can pop up during your combat step and use its massive 7/8 body to kill one of your attackers (although this is at least telegraphed: if your opponent leaves a large number of lands, including at least two Islands, untapped during their turn, use caution)
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