Most played cards in Mardu:

1 Decks
Bloodstained Mire
4 copies – 4 avg
Lingering Souls
4 copies – 4 avg
Chromatic Star
4 copies – 4 avg
Smallpox
4 copies – 4 avg
Rain of Tears
4 copies – 4 avg
Myth Realized
4 copies – 4 avg
Nihil Spellbomb
4 copies – 4 avg
Lightning Bolt
4 copies – 4 avg
Godless Shrine
4 copies – 4 avg
Flagstones of Trokair
4 copies – 4 avg
Crack the Earth
4 copies – 4 avg
Inquisition of Kozilek
4 copies – 4 avg
Timely Reinforcements
3 copies – 3 avg
Wear // Tear
2 copies – 2 avg
Blood Crypt
2 copies – 2 avg
Liliana of the Veil
2 copies – 2 avg
Sacred Foundry
2 copies – 2 avg
Zealous Persecution
2 copies – 2 avg
Kor Firewalker
2 copies – 2 avg
Leyline of the Void
1 copies – 1 avg