Most played cards in Cephalid Breakfast:

3 Decks
Cephalid Illusionist
12 copies - 4 average
Brainstorm
12 copies - 4 average
Aether Vial
12 copies - 4 average
Force of Will
11 copies - 3.67 average
Stoneforge Mystic
11 copies - 3.67 average
Tundra
10 copies - 3.33 average
Flooded Strand
10 copies - 3.33 average
Narcomoeba
9 copies - 3 average
Swords to Plowshares
8 copies - 2.67 average
Nomads en-Kor
8 copies - 2.67 average
Ponder
8 copies - 2.67 average
Misty Rainforest
7 copies - 2.33 average
Recruiter of the Guard
6 copies - 2 average
Scalding Tarn
6 copies - 2 average
Cavern of Souls
6 copies - 2 average
Cabal Therapy
6 copies - 2 average
Spell Pierce
5 copies - 1.67 average
Underground Sea
5 copies - 1.67 average
True-Name Nemesis
5 copies - 1.67 average
Eladamri's Call
4 copies - 1.33 average