Cult Healer

Eerie is the trigger that reads two very different events as one thing: an enchantment you control entering the battlefield, and a Room finishing its second door. Bundling both under a single keyword lets a body like this care about a deck's enchantment density without stapling itself to any one enabler, and here the payoff is deliberately modest. Lifelink until end of turn on a 3/3 is a soft, repeatable stabilizer rather than a game-warping engine: the value scales with how often your enchantments hit the table, but each pulse expires, so it rewards a steady drip of triggers instead of a single explosive turn. That temporary window is the discipline that keeps the card from becoming a life-total runaway. The clause about fully unlocking a Room is the interesting half, because Rooms unlock in stages and only the completed unlock counts; the card is quietly encouraging you to hold that second door for a beat when you want the lifelink attached to a specific attack. Built as a color-appropriate glue piece for an enchantment-matters shell, it asks nothing on cast and gives back only when the rest of the deck is doing its job, which is exactly the kind of role a three-mana common-tier body is supposed to fill.