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Once a Pokemon is Poisoned, it will keep losing HP until its cured or knocked out

Start by bringing out Gaia the Magical Knight and using its effect to Special Summon Curse of Dragon, the Cursed Dragon, you can add Spiral Fusion to your hand and prepare to Fusion Summon Sky Galloping Gaia the Dragon Champion or Gaia the Magical Knight of Dragons

Yu-Gi-Oh

Glory Glory gets bonus points for repeatability, though it comes with the minor hurdle that you need to get Glory into the graveyard in the first place, which often means you need to play this white creature in something other than mono-white

For reference, it is not considered a recovery and loss of life because it is a concept that changes life