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It has a tapped ability that gives out three mana of any one color

People over extend wildly into the RDW player forgetting the potential for them to get wrathed and lose too much tempo and cards to have any hope in the game

A Yawgmoth's Will on a permanent is nasty

I don't think this will replace Somberwald Sage in my decks like Maelstrom Wanderer and I don't know if this wants to join or replace Gyre Sage in my +1/+1 counter decks, but Druid can do some things Sage can't like make Blue mana ever or go infinite with Freed From The Real

Here are the percentages: (note when I say "rare" below, I mean rare or mythic rare) Common, common will happen 49% of the time

While it can be argued that a card like Eternal Witness will often work better in some decks than Snapcaster Mage, you cant use that card to give something like Mana Drain flashback at instant speed to stop a key threat and keep you in the game