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Yarok's decks include lots of creatures and other permanents with powerful ETB effects, such as Acidid Slime or Mulldrifter

Counters are a big part of our format, whether its +1/+1s, charge, experience, or even poison

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

A perfected decklist, formed in the later stages of the Aether Revolt standard, was powerful enough that only one realistic counter-deck of Mardu Vehicles could stand against the combo

The triggered ability is so easy to trigger, your opponents will help you do it

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