Prophesied End
The game didn't let me play Prophesied End in my opponent's combat two games in a row. It let my opponent attack and then would only let me play the card on the next phase.
2
votes
Fires246#12103
shared this idea
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Rezzahan#77802
commented
Then most likely either you or your opponent had Yuriko, Blade of the Mighty on the field:
"During combat, players can't cast spells or activate abilities that aren't mana abilities."