Why do rabbit feet, a symbol of luck, give you potions of leaping when potions of luck exist? I'd suggest rabbit hide brews leaping potions instead (since it's not the best source of leather) and rabbit foot brews luck potions. Then, you could fermented-spider-eye a luck potion to get a potion of decay. Or instead, you could brew wither skeleton skulls, if you were willing to sacrifice it. Level II Wither would heal the player when used, right?