One Probe, Two Spells, Red Land, Blue Cards

During a Legacy Open run at Competitive REL, Amon casts Gitaxian Probe paying 2 life and targeting Nikki, who responds with Brainstorm. Amon casts Counterspell targeting the Brainstorm. Nikki responds by casting Daze, returning his Volcanic Island to his hand leaving his board empty. As Nikki is resolving Brainstorm, Amon says “Go,” so Nikki untaps and draws for his turn. At this point Amon realizes the Probe was never resolved and calls a judge. What do you do?

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Answer
Amon receives a Warning for Game Rule Violation, and Nikki a Warning for Failure to Maintain Game State. Back the game up to the point where Gitaxian Probe is the only object on the stack. When backing up Nikki’s draw step, choose a random card, Volcanic Island is not excluded as it could have been returned with Brainstorm.