My money is to stick with the individually-strong creatures
Legendary Creature Enchantment - Demigod Counters (CTRL to add secondary) Draw Toothy, Imaginary Friend Partner with Pir, Imaginative Rascal (When this creature enters, target player may put Pir into their hand from their library, then shuffle.) Whenever you draw a card, put a +1/+1 counter on Toothy
Aside from the card handling mechanism, there are some pretty slick details to this build
Sure, it forces your opponents to do the same, potentially refilling their hand with more spells, but also has tons of potential of shuffling away some powerful spell they were holding on to
Saddle only as a sorcery.) Creature - Brushwagg Mount Counters (CTRL to add secondary) Draw Cleopatra, Exiled Pharaoh Allies At the beginning of your end step, put a +1/+1 counter on each of up to two other target legendary creatures
They start out as a creature with a cool ability, and then flip into a Planeswalker when a specific criterion is met