I mean, if you are going to be turning into any creature type in the game, isnt Dragon the one youd do first
Kenrith, the Returned King If Queen Marchesa is a good commander for a theme deck around knights, then Kenrith, the Returned King is the perfect commander for it
Counters are a common enough boon you might get away with playing this outside of dedicated synergy decks, especially since the mounts ability spreads counters around on its own
Its also in the right colors since Simic is the king of card draw
On top of that, it also requires you to bring 10 sticker sheets each time you play
Tricky Terrain Tricky Terrain has got it where it counts, in the mana base