Imagine turning an army of Saprolings into copies of Augmenter Pugilist with the back side of the card (outside of Commander, of course)
Players could collect, trade, and battle with Pokmon cards, adding another layer of engagement to the franchise
Nami and Chopper represent core Straw Hat crew popularity
For players who frequent the same playgroups with the same decks week after week, introducing lock cards which target only one deck at the table will inevitably be taken as personal, even if just within the politics of threat assessment. Sleeving up these sorts of cards can feel like the start of a spiteful arms race, where players without the resources to change commanders regularly are sitting ducks against spells never balanced for main-decking against known opposition
The best Lili card in the game, and maybe one of the best planeswalker cards ever, has officially entered Standard and, more notably, Pioneer
Becoming the Monarch is one of the better statuses you can claim in a game, giving you an extra card each turn and a new level of politics in a match