Most played cards in Rest in Pieces:

4 Decks
Force of Will
15 copies - 3.75 average
Flooded Strand
13 copies - 3.25 average
Swords to Plowshares
12 copies - 3 average
Brainstorm
12 copies - 3 average
Rest in Peace
11 copies - 2.75 average
Ponder
9 copies - 2.25 average
Tundra
9 copies - 2.25 average
Polluted Delta
8 copies - 2 average
Energy Field
8 copies - 2 average
Jace, the Mind Sculptor
7 copies - 1.75 average
Meddling Mage
7 copies - 1.75 average
Helm of Obedience
7 copies - 1.75 average
Enlightened Tutor
5 copies - 1.25 average
Counterspell
5 copies - 1.25 average
Transmute Artifact
4 copies - 1 average
Dimir Signet
4 copies - 1 average
Baleful Strix
4 copies - 1 average
Engineered Explosives
4 copies - 1 average
Chalice of the Void
4 copies - 1 average
Mindbreak Trap
4 copies - 1 average