Spectral Flight

The textbook evasion Aura, and the one most other "gives flying and a buff" enchantments get measured against. Two mana converts any ground creature into a 2/2-larger evasive threat, which on a small body turns a stalled board into a clock and on anything bigger turns a beater into a finisher most of the opponent's blockers can no longer touch. Aura design lives and dies on the card-disadvantage problem (one removal spell answers both the Aura and the creature it sits on), so the question every Aura has to answer is whether the swing it provides outpaces that risk. Spectral Flight clears the bar by being cheap enough and large enough that a single connected hit often pays for the two-for-one before the opponent can punish it. Of the two effects, flying carries more weight than the +2/+2: it separates a creature that merely trades in combat from one that races unblocked, and stapling evasion to a stat bump is clean color-pie work, since blue's contribution to aggressive starts has long been flyers rather than raw size. Nothing here is novel; the design is deliberately plain, a reliable tempo enabler for any aggressive deck willing to accept the inherent fragility of building toward a win onto a single body.