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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

Youre restricted to power 2 or less, but even then, we can be creative

If a card or token enters as a copy of a permanent, the new permanent isn't kicked, even if the original was

While we normally want to buff our own creatures, the ability loss becomes problematic

Further, why is this card considered one of the best artifacts to come into the format in years