Most played cards in Cephalid Breakfast:

4 Decks
Hermit Druid
16 copies - 4 average
Gemstone Mine
16 copies - 4 average
City of Brass
16 copies - 4 average
Cephalid Illusionist
16 copies - 4 average
Nomads en-Kor
16 copies - 4 average
Cabal Therapy
16 copies - 4 average
Eladamri's Call
13 copies - 3.25 average
Reanimate
13 copies - 3.25 average
Duress
12 copies - 3 average
Exhume
10 copies - 2.5 average
Llanowar Wastes
10 copies - 2.5 average
Meddling Mage
9 copies - 2.25 average
Worldly Tutor
8 copies - 2 average
Caves of Koilos
8 copies - 2 average
Yavimaya Coast
8 copies - 2 average
Engineered Plague
7 copies - 1.75 average
Reflecting Pool
7 copies - 1.75 average
Brushland
7 copies - 1.75 average
Absolute Law
6 copies - 1.5 average
Shallow Grave
5 copies - 1.25 average