Back then, people didnt realize they were holding what would eventually become some of the rarest and most sought-after cards in the entire game, and among all TCGs
I don't know if the designers would want this effect to be in Standard, necessarily, but it could potentially be slipped into a Commander precon deck
Honestly, this is true for all difficult decks to play, and for all players (I am on week 2 of trying to learn to play Leviathan optimally even though it quickly became one of my favorite decks and taught me worlds about water control as a whole for other archtypes)
The problem is that Yorion Jeskai Lukka is not actually reliant on its namesake card, and other decks warping themselves to simply account for Lukka is unlikely to force the deck out of the metagame
(Don't apply Weakness and Resistance for Benched Pokemon.) Weakness: Metal (x2) Resistance: none Retreat: 3 Mamoswine - Water - HP180 Stage 2 - Evolves from Piloswine [W][C][C] Blizzard: 80 damage