Invasion of Dominaria // Serra Faithkeeper

Four life and a fresh card the instant it lands: that is the whole reward, paid up front, before any combat happens. Most Sieges withhold their payout behind an opponent's defense meter, treating the enter trigger as a courtesy and the flipped side as the real draw. This one reverses that math. The lifegain and cantrip are the floor, guaranteed the moment it resolves, and Serra Faithkeeper (a flying, vigilant Angel) is the ceiling you only reach if the battle actually gets cleared. Because a Siege is a shared object you and others can attack, whether it ever flips is a communal race rather than something you steer alone, which means the front side has to stand on its own. It does. A colorless card that gains life and replaces itself belongs to a lineage older than battles: the cheap white value shape that has always stapled incidental lifegain to a draw and let any creature attached to it be gravy. What makes this one an easy entry to the mechanic is exactly that unconditional cushion. You have already been compensated for casting it, so the uncertainty around whether the Angel ever arrives costs you nothing.