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.
Judges feel free to answer on Judge Apps!Answer