It eventually ends with Sol'Kanar the Tainted being flickered under an opponent's control, but I like the idea of building in some flicker cards to keep it on my side of the battlefield
The basic idea is the common version of the Turtles shows them sort of turtling up at home, in the lair, training
Also, I could see both Dromoka's Command and Dragonlord Atarka being excellent additions to this deck: the former as a versatile card that can also serve as removal, the latter as a game-changing card that can also serve as removal
Ravenous Trap Ravenous Trap can be great against decks milling huge chunks of cards via Mesmeric Orb or dredge cards
You need to put counters onto creatures, which is something many green and red decks already do, especially those with modified synergies
Yarok's decks include lots of creatures and other permanents with powerful ETB effects, such as Acidid Slime or Mulldrifter