The value of X is calculated only once, as the reflexive triggered ability resolves
I have, in the past, made use of the fact that this is a human warrior, as warriors were a thing in the Khans block and humans are always a thing
The Doctor Who Timey-Wimey Commander Deck includes 1 ready-to-play Blue-Red-White deck of 100 Magic cards (2 Traditional Foil Legendary Creature cards, 98 nonfoil cards), 10 Planechase cards, 1 six-sided planar die, a 2-card Collector Booster Sample Pack (contains 2 Traditional Foil or nonfoil special treatment cards, with 1 Common or Uncommon and 1 card of rarity Rare or higher), 1 foil-etched Display Commander (a thick cardstock copy of the commander card with foil etched into the cards border and art), 10 double-sided tokens, 1 deck box (can hold 100 sleeved cards), 1 Life Wheel, 1 strategy insert, and 1 reference card.
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Create a 2/2 green Bird creature token with "Whenever a land you control enters, this token gets +1/+0 until end of turn." If the target is illegal when Choco-Comet tries to resolve, it won't resolve and none of its effects will happen
