Its easy to see why any counter-focused deck thats in Green would benefit from the presence of an Evolution Sage
2 mana to cast and equip this Legendary card is already a good rate, and the fact that it generates 2 counters, which you can use even while it is unattached , anytime its equipped creature deals combat damage (thats attacking OR blocking) is insane
While we normally want to buff our own creatures, the ability loss becomes problematic
Abilities are becoming bigger themselves, and theyre becoming bigger parts of the game
It pairs well with burn cards found in red (such as Choco-Comet), while the black half of the archetype can handle taking care of problem creatures through removal or forced sacrifice (such as Cornered by Black Mages)
Another mind bender regarding the 'drawn this turn' clause is if you preceed the Library trigger with a draw effect