Cryptic Coat and Rattlechains
My opponent had a supreme phantom and two disguised creatures in play, each equipped with a crytpic coat. I bounced their supreme phantom using Petty Theft, and they immediately replayed it as though it had flash. I conceded and saw that one of the disguised creatures was rattlechains. So rattlechains was giving other spirits flash without being face up.
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DAC169#34537 commented
@Heart#97945 3 things:
1) it's safe to assume it's their own turn as the specifically mentioned their opponent playing it "as though it had flash"
2) can't say for Bo3, but in Bo1 it does let you look at face down cards after the match ends
3) this is a KNOWN BUG of cloaked creatures with effects that still occur even though they are face down
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Heart#97945 commented
Two things, did you do this (instant speed spell) on their turn, meaning they could just recast it?
If you conceded, then how would you know what one of the disguised creatures is? That information isn't revealed when you concede.
I will say, morphing/disguise cost to flip a creature face up is a special action and doesn't use the stack. Rattlechains has no triggered abilities on morphing (as usually it can't be cast face down). So they could flip it face up and cast Supreme Phantom basically all in one action.