Most played cards in Yidris, Maelstrom Wielder:

2 Decks
Eternal Witness
2 copies - 1 average
Scavenging Ooze
2 copies - 1 average
Ponder
2 copies - 1 average
Acidic Slime
2 copies - 1 average
Volcanic Island
2 copies - 1 average
Watery Grave
2 copies - 1 average
Windswept Heath
2 copies - 1 average
Wooded Foothills
2 copies - 1 average
Snapcaster Mage
2 copies - 1 average
Murderous Cut
2 copies - 1 average
Go for the Throat
2 copies - 1 average
Liliana of the Veil
2 copies - 1 average
Demonic Tutor
2 copies - 1 average
Jace, the Mind Sculptor
2 copies - 1 average
Arid Mesa
2 copies - 1 average
Brainstorm
2 copies - 1 average
Verdant Catacombs
2 copies - 1 average
Lightning Bolt
2 copies - 1 average
Abrupt Decay
2 copies - 1 average
Ancestral Vision
2 copies - 1 average