Pursuit of Flight

The +2/+2 is doing the heavy lifting here; the flying clause is a hedge against the stall. Most aggressive Auras buy you raw stats and trust the ground to stay open, but a two-color build that splashes blue gets a permanent evasion switch riveted onto the enchanted creature: any turn the board clogs, a single blue mana lifts the threat over a wall of blockers and sets it back down at end of turn. That repeatable, on-demand evasion is the reason the design wants two colors rather than rewarding a mono-red shell, which has no way to turn the ability on and is left holding a flat power-pump Aura. The cost is the cost every Aura pays: tempo and card economy concentrated onto one body, so a single removal spell answers both halves at once and leaves you down a card. As a two-drop it asks you to accept that risk in exchange for a clock the defending player cannot wall off indefinitely, provided you can keep the blue mana flowing to feed the switch.