Until end of combat, you dont lose this mana as steps end
Finally, I'll point out that Marneus, Alela, and Raffine all also play into an Esper sub-theme that may be subtle, but is definitely powerful: aggro-tempo
New game-changing abilities give different Pokmon types more play, while other items and support cards bring new elements into matches that need to be considered by players
One powerful idea is to combine Flash with Protean Hulk, where you Flash in Protean Hulk, let it die, search up Karmic Guide and Carrion Feeder, reanimate Protean Hulk with Karmic Guide, sacrifice it to Carrion Feeder for another trigger, fetch Kiki-Jiki, Mirror Breaker, use Kiki-Jiki, Mirror Breaker to copy Karmic Guide and sacrifice Kiki-Jiki to Carrion Feeder in response, which lets you reanimate with the Guide's ability