Assuming no other counters, that would three to six, six to twelve, and then twelve to 24, which is huge and makes me want to do this for a creature that has double strike, like God-Eternal Oketra, Samut, Voice of Dissent, or even cooler: Bruse Tarl, Boorish Herder
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And again, you could decide to blink it repeatedly
It can make its own mana rocks by simply tapping and paying three mana that will stay on the battlefield even if Svella ever leaves it
Single Strike Energy Single Strike Energys biggest strengths are its damage boosting effect and its ability to be attached by Houndooms Single Strike Roar ability, but its recyclability with Urn of Vitality gives it an even bigger push to be one of the best cards in the set.
So what do you think