Great Train Heist's second mode affects only creatures you control at the time Great Train Heist resolves
Better yet, you get to keep the mana it generates until the end of your turn rather than lose it at the end of combat
As a split card counts as two cards with two separate names, if there is an effect that makes you choose a card name, you can choose one of the card's names and the effect will only take place on that card instead of both of them
It may not reshape the Commander landscape, but it proves that Universes Beyond can deliver both flavor and function in a way that feels right at home at the Commander table.
In this duel, Yugi only summons a regular Celtic Guardian, not an Obnoxious Celtic Guard
Because the last ability of each Opposition Agent is trying to exile the card and give permission to play it, the owner of the exiled card chooses which effect wins