Mistcaller Bug
Mistcaller is such a cool combo piece — I was really excited to craft the wildcards for a playset of them for a Mono U Tempo-Control deck with The Phasing of Zhalfir and Crafty Cutpurse, but unfortunately due to a bug, Mistcaller is merely a vanilla 1/1 that can sacrifice itself for no effect.
I was pretty pumped to draw into my combo on turn 5, played Mistcaller for 1, sacrificed it, and then played The Phasing of Zhalfir, reading ahead to its third ability. I was so pumped to wipe their board and stabilize, but they still got their tokens.
Also I assume the bug is universal, but I was playing on my iPhone
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[Deleted User] commented
Mistcaller exiles nontoken creatures that weren't cast. The Phasing of Zhalfir creates token creatures.