Defy Gravity

The whole pitch is in the second cast. As a one-mana trick granting flying for the turn, this is unremarkable: blue has printed that effect at this rate many times over. Flashback is what changes the math. You spend a single blue mana now to push a creature over a ground-bound board, then return for it from the graveyard later for one more blue, wringing two separate evasion windows out of one card slot. That refusal to stay a dead resource is what earns it over its single-shot peers. The timing it cares about is the declare-attackers step: the creature has to be airborne before blocks are assigned, since granting flying after blockers commit does nothing to the combat already in motion. Cast it as you swing and the ground creatures simply cannot be declared as blockers. The neutral wording cuts the other way too, lifting a creature clear of a sweeper or targeted effect that only reaches non-fliers, a defensive line the attack-shaped instinct tends to overlook. The trick's ceiling is deliberately low: one creature, flying only, no power boost, no other keyword, so it never functions as an alpha-strike enabler. What it offers instead is durability across a long game. Because the first cast feeds the graveyard half, it keeps paying out: spend it early on a chump-proof attack, and the flashback is still waiting when the same window comes up again.