Most played cards in Lazav, the Multifarious:

4 Decks
Sol Ring
2 copies - 0.5 average
Mox Diamond
2 copies - 0.5 average
Mana Vault
2 copies - 0.5 average
Animate Dead
2 copies - 0.5 average
Mana Crypt
2 copies - 0.5 average
Bloodstained Mire
2 copies - 0.5 average
Necromancy
2 copies - 0.5 average
Dance of the Dead
2 copies - 0.5 average
Cephalid Coliseum
2 copies - 0.5 average
Vampiric Tutor
2 copies - 0.5 average
Mystical Tutor
2 copies - 0.5 average
Misdirection
2 copies - 0.5 average
Mental Misstep
2 copies - 0.5 average
Memory Lapse
2 copies - 0.5 average
Remand
2 copies - 0.5 average
Spell Pierce
2 copies - 0.5 average
City of Brass
2 copies - 0.5 average
Jace, the Mind Sculptor
2 copies - 0.5 average
Spell Snare
2 copies - 0.5 average
Chrome Mox
2 copies - 0.5 average