Spirit Loop

Most lifegain auras price the life you get into the enchantment and call it a day; this one refuses to die. The recursion clause is the whole mechanism: stick it on an attacker, gain life when the creature deals damage, and when the body dies you do not lose the aura, you get it back to recast next turn. That turns a fragile two-card investment (creature plus aura) into a half-investment, because the aura survives whatever kills the creature underneath it. The lifegain scales with whatever damage the enchanted creature deals rather than a fixed number, and the trigger reads "deals damage," not "deals combat damage," so a fight spell, a ping ability, or any direct damage the creature throws also refills you; the natural home is anything that hits hard or hits often, but the door is wider than combat alone. What it really answers is the structural flaw in aura-based lifegain, which has always been that removal eats both halves and leaves you down a card. Pay the recast cost and that math reverses. The drawback is built into the loop: you have to recommit mana and a target each time the creature falls, so it taxes your tempo even as it refuses to be card disadvantage. It sits in a small family of return-to-hand auras that trade raw efficiency for resilience, and it leans hardest of that group on a clock you supply yourself.