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Played in over 350,000 Commander decks, its safe to say that Esper Sentinel is both popular and powerful

Lastly, against all Gren Majus effect negation is key to shutting them down

Yes, even Sylvan Primordial, which was legal up until 2014

1 Ripples Of Potential It's All In The Name Ripples of Potential is the card from Explorers of the Deep most likely to see extensive play in Commander

Its effect also triggers when targeted by a card effect so you yourself can even exploit this ability without needing your opponent to attack

And I think more creatures like this would have saved the reputation of the card type at the games inception