You keep all cards you draft, regardless of your win record
Lets take, for example, Andrew Cuneos Dimir Control deck from the Kaldheim Championship
The copies that the ability creates are created on the stack, so they're not cast
This is a card with a lot of ways to make your opponent hurt
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Environmental SciencesEnvironmental Sciences (12.7K Inclusions, 0.17% of 7.27M Decks) Oh hey look, it's Aang's JourneyAang's Journey, but without the kicker option to go get a Shrine