Field of Souls

Death insurance, written as an enchantment. The design idea is converting attrition into a board: every nontoken creature you lose from the battlefield comes back as a flying body, so trades that should leave you behind instead leave you with a flock of fliers. The nontoken restriction is what keeps the card from collapsing into a loop. Without it, the Spirits would feed on themselves alongside any token-maker you ran, and a single sacrifice outlet could manufacture chump blockers forever. Limiting the trigger to "real" creatures means you have to actually own and lose meaningful permanents to earn the payoff, tying the engine to genuine board commitment rather than a free combustion. What it punishes most is the sweeper. A wrath that clears your side of nontoken creatures simultaneously refills it with one Spirit per creature lost, turning your opponent's reset into your swarm. It rewards going wide with creatures you were happy to spend anyway, and quietly taxes any removal-heavy plan that expects killing your stuff to leave you with nothing. The 1/1 flier is the right size: small enough that the replacement is never a strict upgrade, evasive enough that a wide grindout actually closes games. This is white's version of a graveyard-payoff engine that asks nothing of the graveyard itself, only that your creatures die where it can see them.