Most played cards in Metalcraft WW:

2 Decks
Tempered Steel
8 copies - 4 average
Signal Pest
8 copies - 4 average
Glint Hawk Idol
8 copies - 4 average
Inkmoth Nexus
8 copies - 4 average
Memnite
8 copies - 4 average
Leonin Relic-Warder
8 copies - 4 average
Hero of Bladehold
8 copies - 4 average
Glint Hawk
8 copies - 4 average
Mirran Crusader
7 copies - 3.5 average
Origin Spellbomb
6 copies - 3 average
Chimeric Mass
6 copies - 3 average
Phyrexian Revoker
6 copies - 3 average
Mox Opal
5 copies - 2.5 average
Revoke Existence
4 copies - 2 average
Sphere of the Suns
3 copies - 1.5 average
Perilous Myr
3 copies - 1.5 average
Master's Call
3 copies - 1.5 average
Contagion Clasp
2 copies - 1 average
Leonin Arbiter
2 copies - 1 average
Elspeth Tirel
2 copies - 1 average