SaintRxse didn't specify the playstyle for this deck
Im not sure the final build of this theoryized archetype in my head, but Switch [Scarlet and Violet], Escape Rope [Battle Styles], Switch Card [Astral Radiance], and Furisade Girl [Silver Tempest] all seem like great ways to build up damage on your opponents side of the board with that Ability
Spells can either be equipped, have a continuous effect, a quick-play spell that can be activated when the opposition is playing, or field spells that remain on the field
That small may have sarcasm written all over it but this is honestly very cheap when it comes to the more rare trading cards in good condition
Mega Latios EX can only be obtained from this limited-time event, which means all the TCG Pocket players must participate to get their hands on this rare card
Stuff a bunch of allies into your deck and it can make a huge amount of mana for you every turn