Option 1 - It teleports you to a death certificate-esque room with every untainted/tainted character in the game, depending on your starting character.

Option 2 - It works the same way but doesn't change your stats, health or cause you to lose any items.

Option 3 - It turns you into a different character for the current floor only. Even if you use it multiple times, you will switch back to your original character with your original stats (not health though) on the next floor. Alternatively make it a one room charge and make it work only for the current room.

Option 4 - Fuck the character swapping and embrace the "lose the newest item" effect. Turn it single-use and make it drop all items of quality 0 and 1 on the floor.