Andrew is playing against Nadine in a Standard PPTQ. During Andrew’s turn he says, “Oath?” tapping a Forest while holding out an Oath of Nissa. Nadine lets it resolve and Andrew draws three cards, and discards an Island and a Forest. Andrew realizes that he resolved his trigger incorrectly and calls for a judge, explaining that he thought he was playing an Oath of Jace. What do you do?

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Andrew receives a warning for Hidden Card Error. The root cause is adding 3 cards into a set (his hand). Return the two discarded cards to Andrew’s hand. Then have Andrew reveal his hand to Nadine, where she will select 3 cards to create the Oath of Nissa set. Instruct Andrew to continue resolving the Oath of Nissa trigger.

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