Then youll use your energy, always as a result of a trigger or activation, never (yet) as a casting cost in the upper right corner or a card
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More importantly here, however, I wanted to highlight the cards that are being deemed good enough for the highest level of play that aren't appearing on our list of most-played looters: I've already mentioned KitsaKitsa, but the long and short of it is that if you're looking for a traditional Merfolk LooterMerfolk Looter, this is the best one available at this point, hands down
The one rule of lifegain: sources feed payoffs A lifegain deck has two halves, and it is dead without both: Sources cards that gain you life, ideally incrementally and repeatedly (lifelink, whenever a creature enters triggers, upkeep gainers)
It was not sold in any booster pack, theme deck or anywhere else