Making it so Acrobatics not only draws you cards and discards a Sly card, but also gains you energy so you can keep playing more copies of it, is very powerful. Also a useful card for putting together big turns with cards like Malaise sometimes. Awkward to take in Act 1, where consistent damage and block are so important, but it's a card I hope will be strong by the time I reach Act 3. Very good upgrade; doubling the effect of the card is a lot.
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