The 71 new cards in the decks are set on the world of Ikoria, but the reprints can be from anywhere. There are a handful of cards from the main Ikoria set in these decks in the reprint slots, but the number is fairly small. The cards are only legal in Eternal formats like Legacy, Vintage, and Pauper.

Decklist

Planeswalker (1)

1 Ajani Unyielding

Creature (34)
1 Tayam, Luminous Enigma
1 Nikara, Lair Scavenger
1 Yannik, Scavenging Sentinel
1 Avenging Huntbonder
1 Cartographer's Hawk
1 Vitality Hunter
1 Daring Fiendbonder
1 Slippery Bogbonder
1 Akroma, Angel of Wrath
1 Angel of Finality
1 Cataclysmic Gearhulk
1 Kalemne's Captain
1 Odric, Lunarch Marshal
1 Reveillark
1 Solemn Recruit
1 Sunblast Angel
1 Zetalpa, Primal Dawn
1 Cairn Wanderer
1 Soul of Innistrad
1 Soulflayer
1 Hornet Queen
1 Majestic Myriarch
1 Splinterfright
1 Archon of Valor's Reach
1 Karametra, God of Harvests
1 Void Beckoner
1 Titanoth Rex
1 Aerial Responder
1 Vampire Nighthawk
1 Acidic Slime
1 Sakura-Tribe Elder
1 Satyr Wayfinder
1 Skullwinder
1 Nyx Weaver

Sorcery (7)
1 Selective Adaptation
1 Ever After
1 Duneblast
1 Unbreakable Bond
1 Unburial Rites
1 Cultivate
1 Harmonize

Instant (6)
1 Obscuring Haze
1 Blood Curdle
1 Abzan Charm
1 Deathsprout
1 Despark
1 Grisly Salvage

Artifact (7)
1 Netherborn Altar
1 Mimic Vat
1 Bonder's Ornament
1 Arcane Signet
1 Commander's Sphere
1 Sol Ring
1 Swiftfoot Boots
Enchantment (6)
1 Together Forever
1 Abzan Ascendancy
1 Deadbridge Chant
1 Martial Impetus
1 Parasitic Impetus
1 Predatory Impetus

Land (38)
1 Nesting Grounds
1 Canopy Vista
1 Caves of Koilos
1 Exotic Orchard
1 Gavony Township
1 Grim Backwoods
1 Sungrass Prairie
1 Blighted Woodland
1 Command Tower
1 Golgari Rot Farm
1 Krosan Verge
1 Memorial to Folly
1 Myriad Landscape
1 Orzhov Basilica
1 Sandsteppe Citadel
1 Selesnya Sanctuary
1 Blossoming Sands
1 Evolving Wilds
1 Jungle Hollow
1 Scoured Barrens
7 Plains
7 Swamp
4 Forest