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It's very strong in multiplayer since you are more likely to be running at least one opponent with Green ramp and two-drop ramp spells like Rampant Growth and Farseek are getting added to ramp brews in Commander over conventional ramp like Cultivate and Kodama's Reach, so on the turn you have three mana, one player casting a two mana ramp spell with an extra land is pretty likely, and if not, then someone probably cast Explore spells or dropped an Exploration and an extra land or two

The recent Brawl decks are a great example of this

Yuna is there to help make sure your counters dont go to waste when creatures are destroyed

That creates a powerful way to build around him, but you are casting your foe's stuff, not yours, so it's harder to break