Ultimately, its inclusion depends on the overall strategy and synergy of the deck
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Along with Stasis, Winter Orb is the card that EDH players hate the most
(Each deals damage equal to its power to the other.) Number 239 Language English Legal Formats Commander, Legacy, Modern, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Pioneer, Standard, Timeless Rulings (10/4/2004) The power of the creatures when the effect resolves is used to determine how much damage is done
Now, considering it's only possible to trigger this ability once during each of your turns, it's easy to see why it hasn't translated all that well in a multiplayer setting
If your opponent comes in with a couple of Grizzly Bears and you answer