Nesting Avisaur is a Unit.
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The decreased cost can apply multiple times, so if you choose a card that has already had a decreased cost, the card's cost will decrease further.
You cannot decrease a card's cost below 0.
If you put a card with Echo (i)Echo:
Get an additional copy when drawn. on top of your deck, when you draw it, both copies of the card will have a decreased cost.