Mystical Tether
I am playing on PC. I had plotted a Mystical Tether off of a Create Your Own Luck. I was unable to cast Mystical Tether with flash on my opponent's turn. I had expected that I could cast it for the extra 2 to be able to remove an attacker.
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Linkmaster#39212 commented
My opponent cast Mystical Tether with flash for only 3 mana. Lost me a game most likely
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Evu#00213 commented
This probably isn't a bug. Make Your Own Luck causes the card to become plotted, and plotted cards can only be cast at sorcery speed, even if they would normally be playable at instant speed.
"702.170d A plotted card’s owner may cast it from exile without paying its mana cost during their main phase while the stack is empty during any turn after the turn in which it became plotted."