Amulet of Impending Doom

Level 1:
Each player may discard a card on their upkeep.
If they don't, they lose 1 life.
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{2}{u/b} Level 2:
Whenever an opponent doesn't discard a card,
you gain 1 life.
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{5}{u}{b} Level 3:
When this artifact reaches level 3, each opponent sacrifices three non-token creatures. You may put up to three of those creatures onto the battlefield under your control.