You are a floor judge for Day 2 of a Modern Grand Prix. Adrian plays his second land, then casts Thalia, Guardian of Thraben. Natalie lets Thalia resolve, and at the end of Adrian’s turn, casts Fatal Push, targeting Thalia, by tapping her only land. Adrian shrugs and moves Thalia to the graveyard. Natalie untaps, draws for turn, then Adrian points out that Natalie could not cast the Fatal Push due to Thalia’s cost increase. They call for a judge, and Adrian tells you that he received penalties for the same mistake twice yesterday.
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Natalie receives a Warning for a Game Rules Violation, and Adrian receives a Warning for Failure to Maintain Game State. Failure to Maintain is not upgraded after a third warning, and penalties also do not upgrade across days in a multi-day event. Let both players know this, and we should thank Adrian for being honest. The game should be backed-up to the point where Fatal Push was cast, including selecting a random card in Natalie’s hand, returning it to the top of her library, returning Fatal Push to her hand at the end of Adrian’s turn, and untapping the land.