Pulse of the Fields

The lifegain that refuses to leave. Most one-shot lifegain spells fire once and head to the graveyard; this one ties its own recursion to the score, returning to hand whenever an opponent is still ahead on life. That conditional rewrite of card economy is the entire design conceit: as long as you are behind, it is not a card you spend, it is a card you rent for three mana and get back, a renewable buffer against aggression that costs you nothing in hand size over the long game. The four life is deliberately modest, because the loop, not the number, is the power. The clause is also a self-correcting throttle: the moment your gains pull you ahead, the spell stays in the bin, so it can never run away into an infinite life engine on its own. It is one of three "Pulse" instants from the same set, each rebounding under a color-appropriate condition (Pulse of the Forge for matching low life, Pulse of the Grid in blue), and the white one is the defensive anchor of the trio. The design problem it resolves is durable lifegain without runaway value: a card that can be cast turn after turn while you are under pressure, then quietly retires the instant the pressure lifts.