It's no longer rainbow, which is nice.... but now it's also cheaper.
Compare:
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I get the feeling that this shard's power hasn't changed much at all - it still only takes a Nova to power a fully upgraded one, and a Supernova to power the unupgraded one. At worst, you'll spend 2 Nova + 1 SoB to draw 2 cards, which is 3-for-2 (3-for-3 if you're running a fire mark.), and breaking even isn't bad when you have 12-22 more quanta and 2 cards to play it with.