Circle of Solace

This is the cautious answer to a tribal era's central question: if creature types are going to matter, what does a defensive card that cares about type look like? The result is a pillow-fort piece priced by repetition rather than impact. You name a type as it resolves, then pay each turn to blank the next single instance of damage from a creature of that type. The structure tells you exactly what it is and is not good against. Against a wide swarm it disappoints: one activation stops one attacker's worth of damage, the rest of the board connects, and you cannot tax your way out fast enough to matter. Where the math actually works is the opposite shape, a tall threat of a known type, a lone tribal beater swinging for a pile, where one reliably nullifies the whole connection turn after turn. The choice made on entry is the constraint that pays for the repeatable prevention: guess wrong against a varied curve and the enchantment does nothing, name correctly against a homogeneous deck and you have a wall it cannot route around. Most fog-and-tax enchantments care about how many creatures attack or how much mana the opponent spends; this one cares about what kind, which makes it a narrow but oddly precise tool, devastating against single-type aggression and dead weight against everything else.