Most played cards in Dump Truck:

4 Decks
Meddling Mage
16 copies - 4 average
Force of Will
16 copies - 4 average
Brainstorm
16 copies - 4 average
Tundra
15 copies - 3.75 average
Wasteland
14 copies - 3.5 average
Shadowmage Infiltrator
13 copies - 3.25 average
Swords to Plowshares
13 copies - 3.25 average
Exalted Angel
12 copies - 3 average
Stifle
12 copies - 3 average
Underground Sea
12 copies - 3 average
Duress
11 copies - 2.75 average
Flooded Strand
11 copies - 2.75 average
Polluted Delta
10 copies - 2.5 average
Disenchant
9 copies - 2.25 average
Daze
8 copies - 2 average
Mana Drain
8 copies - 2 average
Tormod's Crypt
6 copies - 1.5 average
Null Rod
6 copies - 1.5 average
Phyrexian Negator
5 copies - 1.25 average
Vindicate
4 copies - 1 average