Most played cards in Gifts Rock:

2 Decks
Kitchen Finks
8 copies - 4 average
Gifts Ungiven
8 copies - 4 average
Sakura-Tribe Elder
8 copies - 4 average
Temple Garden
8 copies - 4 average
Path to Exile
7 copies - 3.5 average
Eternal Witness
7 copies - 3.5 average
Arid Mesa
6 copies - 3 average
Marsh Flats
6 copies - 3 average
Duress
5 copies - 2.5 average
Thoughtseize
5 copies - 2.5 average
Cranial Extraction
5 copies - 2.5 average
Ravenous Trap
4 copies - 2 average
Pulse of the Fields
4 copies - 2 average
Wrath of God
4 copies - 2 average
Misty Rainforest
4 copies - 2 average
Loxodon Hierarch
4 copies - 2 average
Day of Judgment
3 copies - 1.5 average
Tarmogoyf
3 copies - 1.5 average
Ghost Quarter
3 copies - 1.5 average
Hallowed Fountain
3 copies - 1.5 average