Gryffwing Cavalry
Training was built to reward a small creature swinging next to a bigger one, and this Knight stacks a second aggressive job on top of that role: for one white and one colorless per attack, it hands flying to a grounded attacker. The two abilities feed each other. To grow via training it needs a larger creature beside it, which is precisely the ground-bound bruiser its attack trigger wants to lift over blockers. The flying it already carries keeps it clear of most ground brawls, so it survives to collect counters while the beefier attacker either connects unblocked or forces bad blocks. The payment is a per-attack tax rather than a one-time cost, so a board that keeps swinging can keep buying evasion turn after turn, converting a clogged ground standoff into an air race the whole team wins. The rate is modest and the payoff is incremental, which is the honest cost of loading two attack-dependent triggers onto one 2/2: it needs company to matter and it needs to attack to do anything at all. This is a support piece for a go-wide white aggro shell that wants to push the last points through a stalled board, quietly doing two things at once rather than one thing loudly.

