Most played cards in Hammer Time:

2 Decks
Puresteel Paladin
8 copies - 4 average
Stoneforge Mystic
8 copies - 4 average
Sigarda's Aid
8 copies - 4 average
Esper Sentinel
8 copies - 4 average
Urza's Saga
8 copies - 4 average
Colossus Hammer
8 copies - 4 average
Ornithopter
7 copies - 3.5 average
Seachrome Coast
6 copies - 3 average
Springleaf Drum
6 copies - 3 average
Inkmoth Nexus
6 copies - 3 average
Marsh Flats
6 copies - 3 average
Spell Pierce
5 copies - 2.5 average
Giver of Runes
4 copies - 2 average
March of Otherworldly Light
4 copies - 2 average
Hallowed Fountain
4 copies - 2 average
Windswept Heath
4 copies - 2 average
Blacksmith's Skill
4 copies - 2 average
Mana Leak
3 copies - 1.5 average
Memnite
3 copies - 1.5 average
Sanctifier En-Vec
3 copies - 1.5 average