Balloon Peddler
Spellshapers were an early-era idea for stapling spell effects onto bodies and charging for the privilege in hand: tap the creature, pay a mana, and pitch a card to fire off something a normal instant or sorcery would do. This one buys flying for a turn, repeatable as long as the cards last. The ability can be activated whenever you have priority, and that combat-trick timing is the salvageable part: granting evasion mid-combat can turn a stalled ground board into a finishing swing, push damage past a wall of blockers, or shore up a flier of your own. But the cost structure works against the body it sits on. A 2/2 wants to be deployed and attacking, while the ability wants a full hand to spend, so the creature you cast competes with the cards you would feed it. And the effect itself is the kind keyword evasion or a cheap one-shot trick provides far more efficiently, which leaves the discard tax looking heavier than what a single turn of flying returns. It belongs to a stretch when the question was how much repeatable value a creature-based engine could safely carry before cleaner combat tricks and static keywords made the card-for-effect exchange feel like a bad trade.
