Most played cards in Oath:

4 Decks
 ↓ Force of Will
16 copies – 4 avg
↓ Oath of Druids
15 copies – 3.75 avg
↓ Polluted Delta
14 copies – 3.5 avg
↓ Duress
14 copies – 3.5 avg
↓ Brainstorm
13 copies – 3.25 avg
↓ Tropical Island
12 copies – 3 avg
↓ Underground Sea
11 copies – 2.75 avg
↓ Flooded Strand
9 copies – 2.25 avg
↓ Funeral Pyre
9 copies – 2.25 avg
↓ Mana Drain
8 copies – 2 avg
↓ Swords to Plowshares
5 copies – 1.25 avg
↓ Tundra
5 copies – 1.25 avg
↓ Tormod's Crypt
5 copies – 1.25 avg
↓ Ancestral Recall
4 copies – 1 avg
↓ Black Lotus
4 copies – 1 avg
↓ Demonic Tutor
4 copies – 1 avg
↓ Mox Emerald
4 copies – 1 avg
↓ Mox Jet
4 copies – 1 avg
↓ Mox Pearl
4 copies – 1 avg
↓ Mox Ruby
4 copies – 1 avg