Spreading +1/+1 counters about gives this green creature lasting impact, even after your opponents remove it, despite being on the slower side since you can only use its activated ability once per turn
And speaking of making copies, Psionic RitualPsionic Ritual can be like the instant/sorcery version of Rise of the Dark RealmsRise of the Dark Realms if youve got enough Horrors, or even just a bunch of creatures and a Maskwood NexusMaskwood Nexus, and some full graveyards
Aven Trooper has an upside that sometimes mattered in Odyssey / Torment / Judgment Limited, since it could pitch cards to trigger madness or enable threshold
More stylized approaches like Justine Jones work on Glimpse the Impossible can be just as, if not more effective
While Intruder Alarm wont untap Walking Atlas for combos, Retreat to Coralhelm does, and I wanted to put it in for synergy with our Commander anyways
Then after that, a slot which could contain a serialized Uncommon from the set of 65