The ability wont affect those spells and it wont affect spells that those players cast before you activated it
Pokemon Card Strategy: So as far as strategy goes, I would recommend setting up Blaziken on the bench if possible, get three energy cards on it, then put it into the active Pokemon spot, I would use Flamethrower first, hopefully knocking out the defending Pokemon, then either use Flamethrower the next turn against the new Pokemon, if you have another energy card in your hand, or if the defending Pokemon has more than 130 hp on it, I would use Blaze Kick first and Flamethrower the turn after
Kicking off new releases for the game in 2024 is the third Lorcana set, Into the Inklands, which is introducing a wealth of fascinating new cards and even an entirely new card type
In addition to that stellar selection, you can also find Primal Groudon and Primal Kyogre cards here, which sit just behind Rayquaza as the most valuable cards from Ancient Origins
Blackbloom Rogue and Malakir Rebirth are really not that bad