Most played cards in Grixis Aggro:

1 Decks
Brainstorm
4 copies - 4 average
Street Wraith
4 copies - 4 average
Daze
4 copies - 4 average
Force of Will
4 copies - 4 average
Thoughtseize
4 copies - 4 average
Ponder
4 copies - 4 average
Death's Shadow
4 copies - 4 average
Delver of Secrets
4 copies - 4 average
Misty Rainforest
4 copies - 4 average
Watery Grave
4 copies - 4 average
Wasteland
4 copies - 4 average
Dread of Night
3 copies - 3 average
Surgical Extraction
3 copies - 3 average
Flooded Strand
3 copies - 3 average
Diabolic Edict
3 copies - 3 average
Throne of Geth
2 copies - 2 average
Hymn to Tourach
2 copies - 2 average
Stubborn Denial
2 copies - 2 average
Fatal Push
2 copies - 2 average
Snuff Out
2 copies - 2 average