I can see this enabling some creative plays, especially in conjunction with flicker effects
As you can see from the examples, there are lots of ways to win the game with this approach, lots of ways to stifle early threats, and lots of ways to gain card advantage

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And thats not all: remove flying counters from your creatures placed on them by Luminous Broodmoth, slow down the aging of Cumulative upkeep cards, like Mystic Remora (or Blizzard, if you feel like putting flying counters on opponents creatures like a monster), allow Undying creatures to continually un-die the (giant robotic manta in the) skys the limit
Fell Stinger Deploy the Fell Stinger with its deathly scorpion's sting, and you can exploit (sacrifice another creature,) to evoke its 2 cards for 2 life ability, which can target any player
Regardless of its strengths and weaknesses, Ruby/Emerald is certainly one of the strongest competitive Lorcana budget decks in the game right now, and a great entry-level deck for players wanting to learn the game.