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Ojutai was one of the more merciful authoritarian dragons from Tarkir, but that mercy wont be present when dealing with your opponents as your commander

I would dust off my Castle Embereths and Rimrock Knights before sleeving Atris, Oracle of Half-Truths

While Im not sure if it truly makes the cut in cEDH, you could also cast Return the Favor to make your own copy of the enters-the-battlefield ability of Thassas Oracle to win on top of their ability on the stack

Cetoddle 053/193 Loading

For [2DDD], it deals 200 damage and prevents the Defending Pokmon from retreating on the following turn

PHYREXIAN METAMORPH Like counterspells, blue has an affinity for clones