Most played cards in Yidris, Maelstrom Wielder:

5 Decks
Wooded Foothills
5 copies - 1 average
Steam Vents
5 copies - 1 average
Scalding Tarn
5 copies - 1 average
Polluted Delta
5 copies - 1 average
Overgrown Tomb
5 copies - 1 average
Windswept Heath
5 copies - 1 average
Stomping Ground
5 copies - 1 average
Volcanic Island
5 copies - 1 average
Verdant Catacombs
5 copies - 1 average
Underground Sea
5 copies - 1 average
Misty Rainforest
5 copies - 1 average
Watery Grave
5 copies - 1 average
Bayou
5 copies - 1 average
Blood Crypt
5 copies - 1 average
Bloodstained Mire
5 copies - 1 average
Command Tower
5 copies - 1 average
Flooded Strand
5 copies - 1 average
Badlands
5 copies - 1 average
Marsh Flats
5 copies - 1 average
Breeding Pool
5 copies - 1 average