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With the Pokemon TCG: Black & White expansion, you can discover a legion of over 70 never-before-seen Pokemon from the newly explored Unova region, including new starter Pokemon Snivy, Tepig, and Oshawott, as well as powerful new Pokemon like Zoroark, Galvantula, Reuniclus, plus many more

Then you just need to start the chain reaction, maybe you played a turn 1 soul sister and boom you're done

I havent noticed many lifegain decks running around recently, at least not in Standard, but they do exist in abundance in Pioneer and Explorer, so it might be intended for those formats

The other possibility is playing Invasion of Regatha in a dedicated burn deck since the backside seems pretty powerful with Play with Fire, Lightning Strike, and friends as a weird twist on Torbran, Thane of Red Fell, although I'm not sure a burn deck wants to use multiple burn spells or attacks to remove the five defense counters to defeat the battle