Most played cards in Grixis Delver:

2 Decks
Deathrite Shaman
4 copies - 2 average
Lightning Bolt
4 copies - 2 average
Flooded Strand
4 copies - 2 average
Scalding Tarn
4 copies - 2 average
Ponder
4 copies - 2 average
Force of Will
4 copies - 2 average
Wasteland
4 copies - 2 average
Daze
4 copies - 2 average
Delver of Secrets
4 copies - 2 average
Brainstorm
4 copies - 2 average
Gitaxian Probe
3 copies - 1.5 average
Volcanic Island
3 copies - 1.5 average
Stifle
3 copies - 1.5 average
Surgical Extraction
2 copies - 1 average
Gurmag Angler
2 copies - 1 average
Young Pyromancer
2 copies - 1 average
Cabal Therapy
2 copies - 1 average
Underground Sea
2 copies - 1 average
Diabolic Edict
2 copies - 1 average
True-Name Nemesis
2 copies - 1 average