Most played cards in Bomberman:

4 Decks
Force of Will
16 copies - 4 average
Trinket Mage
13 copies - 3.25 average
Flooded Strand
12 copies - 3 average
Tundra
12 copies - 3 average
Mana Drain
7 copies - 1.75 average
Tormod's Crypt
7 copies - 1.75 average
Swords to Plowshares
6 copies - 1.5 average
Auriok Salvagers
6 copies - 1.5 average
Sensei's Divining Top
6 copies - 1.5 average
Pyroblast
6 copies - 1.5 average
Misty Rainforest
5 copies - 1.25 average
Polluted Delta
5 copies - 1.25 average
Lavinia, Azorius Renegade
5 copies - 1.25 average
Narset, Parter of Veils
5 copies - 1.25 average
Merchant Scroll
4 copies - 1 average
Grafdigger's Cage
4 copies - 1 average
Tolarian Academy
4 copies - 1 average
Ancestral Recall
4 copies - 1 average
Snapcaster Mage
4 copies - 1 average
Containment Priest
4 copies - 1 average