The cards are very uniform, with only some annotations and a league stamp being the major varieties, although they are all extremely rare today
With enough sources to create tokens, the sacrifice cost becomes pretty much insignificant while you consistently draw cards and buff up your creature
Your opponent's turn: You can discard any number of cards, then target the same number of cards your opponent controls
If the gift was promised, you may cast that card for as long as it remains exiled, and mana of any type can be spent to cast it
Specifically, its the Villain-based card draw that will prove most useful
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