Decks like Raging Bolt and Gholdengo can make use of this card to get energy back to set up for attacks on the following turn, which helps them maintain consistency after their board is broken
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But it is very op, as with it you has 2 Gwenhwyfar per turn, with this card being a plus every turn (its effect is the same as having a continuous RotA which activates from the grave, actually)
With the swathe of kill effects on most Assassin creatures, you will be able to trigger Xira almost every turn
Generally, the animation styles of both shows have been pretty much consistent throughout their runs, so it all depends on what you prefer
The total cost of is not bad at all for getting any card from your library, plus two extra cards