Most played cards in Hammer Time:

3 Decks
Snow-Covered Plains
20 copies - 6.67 average
Esper Sentinel
12 copies - 4 average
Sigarda's Aid
12 copies - 4 average
Urza's Saga
12 copies - 4 average
Drannith Magistrate
12 copies - 4 average
Colossus Hammer
12 copies - 4 average
Silent Clearing
12 copies - 4 average
Puresteel Paladin
12 copies - 4 average
Stoneforge Mystic
12 copies - 4 average
Ornithopter
11 copies - 3.67 average
Memnite
10 copies - 3.33 average
Inkmoth Nexus
9 copies - 3 average
March of Otherworldly Light
8 copies - 2.67 average
Springleaf Drum
6 copies - 2 average
Steelshaper's Gift
6 copies - 2 average
Blacksmith's Skill
5 copies - 1.67 average
Mana Tithe
5 copies - 1.67 average
On Thin Ice
4 copies - 1.33 average
Pithing Needle
3 copies - 1 average
Paradise Mantle
3 copies - 1 average