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U/G Karn
A Standard deck, by Sam Pardee
163rd place at a tournament on 2018-06-01

Maindeck:

Artifacts
4 Aethersphere Harvester (Not currently legal in Standard)
3 Implement of Ferocity (Not currently legal in Standard)
2 Sorcerous Spyglass

Artifact Creatures
4 Scrap Trawler (Not currently legal in Standard)
4 Verdurous Gearhulk (Not currently legal in Standard)
4 Walking Ballista (Not currently legal in Standard)

Creatures
4 Glint-Nest Crane (Not currently legal in Standard)
4 Llanowar Elves
1 Servant of the Conduit (Not currently legal in Standard)

Instants
2 Metallic Rebuke (Not currently legal in Standard)

Legendary Planeswalkers
4 Karn, Scion of Urza

Basic Lands
7 Forest
5 Island

Lands
4 Aether Hub (Not currently legal in Standard)
4 Botanical Sanctum (Not currently legal in Standard)
2 Hashep Oasis (Not currently legal in Standard)
2 Hinterland Harbor

Sideboard:
3 Lifecrafter's Bestiary (Not currently legal in Standard)
2 Greenbelt Rampager (Not currently legal in Standard)
2 Thrashing Brontodon
2 Vizier of Many Faces (Not currently legal in Standard)
2 Crushing Canopy
1 Metallic Rebuke (Not currently legal in Standard)
1 Negate
2 Baral's Expertise (Not currently legal in Standard)