Most played cards in Post Control:

3 Decks
Pristine Talisman
12 copies - 4 average
Solemn Simulacrum
10 copies - 3.33 average
Trading Post
10 copies - 3.33 average
Ghost Quarter
9 copies - 3 average
Phyrexian Metamorph
9 copies - 3 average
Cavern of Souls
8 copies - 2.67 average
Rootbound Crag
7 copies - 2.33 average
Bonfire of the Damned
7 copies - 2.33 average
Phyrexia's Core
6 copies - 2 average
Gut Shot
6 copies - 2 average
Ichor Wellspring
6 copies - 2 average
Pillar of Flame
6 copies - 2 average
Whipflare
6 copies - 2 average
Wurmcoil Engine
6 copies - 2 average
Mycosynth Wellspring
6 copies - 2 average
Buried Ruin
5 copies - 1.67 average
Thragtusk
5 copies - 1.67 average
Slagstorm
4 copies - 1.33 average
Karn Liberated
4 copies - 1.33 average
Ancient Grudge
4 copies - 1.33 average