This is a combo deck that looks to mulligan to a copy of Treasure Hunt in its opening hand. You then play Treasure Hunts drawing through your deck and discarding a slew of lands with cycling to eventually cast a giant lethal Zenith Flare.

Companion
1
Kaheera, the Orphanguard
Spells (5)
4
Treasure Hunt
1
Zenith Flare
Lands (55)
4
Fetid Pools
4
Forgotten Cave
4
Hallowed Fountain
4
Irrigated Farmland
3
Island
4
Ketria Triome
4
Lonely Sandbar
4
Mystic Sanctuary
4
Raugrin Triome
4
Scattered Groves
4
Secluded Steppe
4
Sheltered Thicket
4
Steam Vents
4
Zagoth Triome
Cards (60)
Sideboard (15)
4
Blinkmoth Nexus
1
Kaheera, the Orphanguard
4
Nullhide Ferox
4
Shifting Ceratops
2
Chandra, Awakened Inferno