Most played cards in Ad Nauseam:

1 Decks
 ↓ Simian Spirit Guide
4 copies – 4 avg
↓ City of Brass
4 copies – 4 avg
↓ Ad Nauseam
4 copies – 4 avg
↓ Angel's Grace
4 copies – 4 avg
↓ Lotus Bloom
4 copies – 4 avg
↓ Pentad Prism
4 copies – 4 avg
↓ Preordain
4 copies – 4 avg
↓ Serum Visions
4 copies – 4 avg
↓ Pact of Negation
4 copies – 4 avg
↓ Leyline of Sanctity
4 copies – 4 avg
↓ Gemstone Mine
4 copies – 4 avg
↓ Temple of Enlightenment
3 copies – 3 avg
↓ Temple of Deceit
3 copies – 3 avg
↓ Spoils of the Vault
3 copies – 3 avg
↓ Phyrexian Unlife
3 copies – 3 avg
↓ Bontu's Last Reckoning
2 copies – 2 avg
↓ Boseiju, Who Shelters All
2 copies – 2 avg
↓ Echoing Truth
2 copies – 2 avg
↓ Silence
2 copies – 2 avg
↓ Thoughtseize
2 copies – 2 avg