
If a blue source would deal damage to you, prevent 2 of that damage.
Sphere of Reason has 1 printing, first in Odyssey (2001). EDHREC ranks it #30,375 among Commander cards. It appears most in Gosta Dirk decks (2 on EDHREC).
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.