Sky Tether

White has never had clean, permanent removal, so it improvises with prison effects that neutralize a threat without killing it, and this is about as tidy as the pattern gets. Grounding the target strips flying, which handles the evasive attacker white struggles to block, but the more important half is defender: the creature can no longer swing at all, so a game-ending bomb becomes a wall that just sits there. One white mana buys a full pacification of an attacker, cheaper than the Arrest and Pacifism line white usually leans on for the same job. It is not blank against a creature sitting on defense, either: stripping flying downgrades an evasive blocker into a grounded one, which matters plenty when your own attacks want to get through. The catch is the one every Aura carries: it evaporates if the enchanted creature is bounced or blinked, a single removal spell on the Aura hands the threat right back, and it does nothing against a creature that wins without attacking. The whole design leans on the specific fear it answers, the big flier crashing in for lethal; against that, a single mana buys a permanent answer. Narrow by construction, and the narrowness is precisely why it costs so little.