Goblin Bird-Grabber

The gag lands in the name: a Goblin who cannot fly grabbing a ride from whatever winged thing stands next to him. The activated ability reads as a payoff, but it is chained to an enabler you have to supply first: the flying it grants is real and repeatable, yet it refuses to switch on unless you already control a creature with flying. That dependency is the whole design tension. With no flier in play, the ability is dead text bolted to an aggressive 2/1; hold up a single flier and the mana you would otherwise sink into a second body instead lifts this one over a stalled ground. Rather than being good in a vacuum, it is a common tuned to reward a specific board state, converting spare red mana into evasion once the deck holds up its end. The evasion arrives at instant speed, which reads best on defense, where you can grant flying in response to an attack and ambush a flier that assumed the ground was safe. On offense the timing is more exposed: evasion has to be granted before the declare blockers step to do anything, so you tip your hand by pumping mana into the ability, and the defender gets a window to respond before blocks are locked. The restriction is the point of the card, not a footnote to it.