Five mana for a 3/4 flier plus a 2/2 ground body is a rate the format's removal map cannot punish efficiently. Stomped by the Foot and Bot Bashing Time take out one half and leave the other standing. Grounded for Life destroys the Blimp outright but still leaves the Mutant, turning a clean answer into a one-for-one against a two-card package. Dimensional Exile is the only common that removes the Vehicle without conceding the token. That asymmetry is the entire reason to value this above its sticker price.
The Mutant matters most to RW Equipment, which gets a fresh body for Bespoke Bō or Novel Nunchaku the turn the Blimp lands, the rare five-drop that advances an equipment plan instead of clogging the curve. BG Food wants the token for a different reason: as sacrifice fodder while the flier closes, with the deck never spending a separate creature to crew. UR Sneak is the cold seat. The flier is fine there, but turn five wants to be a tempo trigger, not a static board commitment.
P1P5 to P1P7 in any non-blue deck without a settled five-drop, climbing toward P1P4 in RW or BG once the equipment or sacrifice payoffs are visible. Maindeck in those colors. The format's flying commons sit at two toughness and cannot race a 3/4 in the air, so the matchups that want the Blimp lowest are the ground-stall draws where the Mutant blocks poorly and the air is already contested.
