Most played cards in Grixis:

2 Decks
 ↓ Polluted Delta
8 copies – 4 avg
↓ Ponder
8 copies – 4 avg
↓ Brainstorm
8 copies – 4 avg
↓ Force of Will
8 copies – 4 avg
↓ Lightning Bolt
8 copies – 4 avg
↓ Scalding Tarn
8 copies – 4 avg
↓ Volcanic Island
6 copies – 3 avg
↓ Pyroblast
5 copies – 2.5 avg
↓ Surgical Extraction
5 copies – 2.5 avg
↓ Underground Sea
5 copies – 2.5 avg
↓ Arclight Phoenix
4 copies – 2 avg
↓ Ledger Shredder
4 copies – 2 avg
↓ Wasteland
4 copies – 2 avg
↓ Buried Alive
4 copies – 2 avg
↓ Preordain
4 copies – 2 avg
↓ Dress Down
4 copies – 2 avg
↓ Stifle
4 copies – 2 avg
↓ Thoughtseize
4 copies – 2 avg
↓ Dark Ritual
4 copies – 2 avg
↓ Daze
4 copies – 2 avg