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In Commander, its even better because 2-mana counterspells arent considered slow, and the turns when you get to counter a 6-mana spell and follow up with your own 7+ mana spell are devastating
It ramps you a full turn
Recently, CGC was entrusted to authenticate and grade two examples of this card the textless, cosmic foil version of the Soul Stone
Big deck energy: How to build a Commander deck Originally, Companion cards could be played right from the sideboard, but this was deemed too powerful pretty early on, and the rules were updated a couple of months after Ikoria came out
Glorious End ($1.82): So in case youre not aware, there are streamers who can cause a card to spike quickly