Adeline, Resplendent Cathar , Keeper of the Accord , Jacked Rabbit , Defiler of Faith , several of The Wanderer's Planeswalker iterations, Oketra's Monument , and Horn of Gondor all generate tokens
You can then pay mana to transform those cocoons into 0/0 Phyrexian creatures
But you neednt break the bank searching for Eldraines rarest in order for your decks to perform at their peak
They are two of the best +1/+1 counters ever printed, so its great they included them in the first place, but are insane alongside Gatta and Luzzu
You get the colors you need from it right away, but it still has a downside by forcing you to use that mana between your untap step and combat step
Add in some infinite stuff with cards like Ashnod's Altar (I mean, right?) and Luminous Broodmoth, and you have a grindy slugfest