Bark of Doran

The name tips the hand: this is Doran, the Siege Tower, decanted into a two-mana Equipment. Where the original bear-tree wanted your whole board to swap power for toughness at once, this narrows the effect to one attacker at a time, and only when the math actually favors it. The +0/+1 tips a would-be even body into toughness-greater-than-power territory, and only then does the damage-assignment clause switch on. That conditional is the whole engineering job. A flat defensive stat pump is worthless on a creature you actually want to swing with, so the Equipment first manufactures the condition it needs, then cashes it in, turning a wall into a threat that hits for its full defensive value. The design also quietly rewards toughness-matters creatures that were never built to attack: high-toughness, low-power bodies that normally sit back as blockers become clocks the moment this is strapped on. What keeps it fair is the static shape of the damage-assignment ability itself. It reads toughness against power continuously and only rewrites combat math for creatures whose toughness already outstrips their power, so it does nothing for the aggressive one-drops that would abuse an unconditional damage boost. The sorcery-speed equip cost keeps the reconfiguration on your terms rather than as a combat-step ambush. It is a portable, reusable version of an effect that used to demand you commit an entire deck's identity to it.