Phyrexian Pegasus

The evasion-granter is a modest but real category: a flyer that hands its keyword to a groundpounder so a stalled board suddenly has a hole in it. What tightens the leash on this one is the trigger shape. The ability fires on attack and only ever helps one other creature, and only one already committed to the swing. It cannot spring a surprise blocker over a wall, cannot pull a creature out of removal range, and does nothing at all unless it is attacking alongside a nonflyer worth pushing through. The upside scales with a crowded board rather than a single big threat: the more grounded attackers you have, the more the Pegasus is choosing which one clears the skies, converting a middling 2/2 into a repeatable way to lift one creature over a clogged ground. It slots into an aggressive white creature deck without asking for any special structure, doing one specific job (keeping the pressure on once the board jams up) and nothing outside that lane. Flavor-wise, the mechanically mangled winged horse sits cleanly in the Phyrexian mold: a mount rebuilt to lift others into the air. An honest common that knows exactly what it is for.