This card lets you discard and draw on entry, fueling graveyard synergies
It comes only with one use by default, but it is easily rechargeable and because the effect is triggered after Lucius reveals a Chaos Token, he can also choose not to use it if he doesn't need it or if using it wouldn't change the outcome of the test
Since it's an instant, you simply pass your turn, wait until your opponent's upkeep, and then cast it, which is very close to getting an extra turn (the main difference is that your opponent will get to untap)
You often fuel combo decks or control decks with it
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Not only can it be used as an insurance effect against removal effects, but since the method of sending it to the graveyard is not specified, the revival effect can be activated even if you send it to the graveyard