Whenever a creature with power 1 or less is put into your graveyard from the battlefield, you may return that card to the battlefield at the beginning of the next end step if Shirei, Shizos Caretaker is still on the battlefield. Basically, youre going to fill the deck with cards like Viscera Seer, Zulaport Cutthroat, Yaroks Fenlurker, and Big Game Hunter, and just recur them for all of time until you win the game through sheer force of will and the little people fighting back
Proliferate works well here not only by proliferating the growth counters on Simic Ascendancy, but also the counters other creatures, too
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This makes it particularly potent alongside Persist, a mechanic that allows a creature to return to the battlefield as long as it doesnt have a -1/-1 counter on it
A 2/2 body for two mana is more than fair for an average goblin, but this would be better suited to decks with bigger creatures to support so the +1/+0 and Menace can