Uninvited Geist // Unimpeded Trespasser

Skulk is the front face's whole job: an evasion keyword that prevents blocks by creatures with greater power, so the Geist slips past anything bigger and can only be stopped by a defender of equal size or smaller. On a developing board that early-game window, before opponents have stabilized with same-sized chump-blockers, is exactly when the transform trigger wants to fire. Land one hit and the creature flips into Unimpeded Trespasser, whose evasion drops the condition entirely: it cannot be blocked, ever, at any board state. The design is a payoff structured as a threshold. The hard part is the first point of combat damage, and skulk is calibrated to make that first connection achievable without guaranteeing it; the reward is a body that has graduated past the question of blocking. It is the rare double-faced card where both halves do the same thing (get in) at different difficulty settings, and the flip is permanent, so once the Trespasser is online no clock or upkeep cost reverses it. That makes the Geist a self-contained aggressive engine: a three-mana investment in evasion that, if it survives the contested turns, becomes an unanswerable repeatable threat without further input. The transform-on-combat-damage trigger is the connective tissue, converting a conditionally-evasive 2/2 into a permanently-evasive one through the single act it was always trying to perform.