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Yes, "You may play" means you can choose to play it or not

A third category of deck against which Thoughtseize really shines is the reactive control deck

C Common Dekoichi the Battlechanted Locomotive X DARK Level 4 [ MachineFlipEffect ] ATK 1400 DEF 1000 FLIP: Draw 1 card, then draw 1 additional card for each face-up "Bokoichi the Freightening Car" you control

The Rollercrusher Ride seems primed to be a powerful 1v1 effect, but I still think its solid in Commander too

Filling your curve with smaller artifact creatures will fit both flavorwise and mechanically, since your most likely win condition will be combat damage