Theros Stargazing - Five different Secret Lairs featuring fifteen Theros Gods with alt art showing their forms as constellations in the stars
This makes her a pretty formidable card to have in play
If you've never seen Nadu in action, its ability (revealing the top card of your library whenever one of your creatures becomes a target of a spell or ability, then putting it into play untapped if it's a land or putting it into your hand if it's not, twice each turn for each creature) creates not infinite but sort of functionally infinite loops with an equipment that equips for free, like Skullclamp or Lightning Greaves
All of the cards from the Duel Decks are reprints (a couple did get exclusive alternate art) but their unique set symbols should get you where you need to go
The first copy is generally quite good for you but drawing two is a huge problem
Just like the DnD deck it's based on, the card can have a range of effects, some game-winning, other catastrophic