turn everyone's lands into artifacts. Then activate [card]Karn, Silver Golem[/card]'s ability and blow up your opponents' lands by turning them into creatures with power and toughness equal to their mana cost - which is 0/0!
Artifacts (1) 1 Goblin Charbelcher $ 0.47 Enchantments (6) 1 Goblin Bombardment $ 2.50 1 Goblin Assault $ 0.91 1 Goblin Caves $ 0.95 1 Goblin Shrine $ 0.25 1 Goblin War Drums $ 0.25 1 Goblin Warrens $ 0.79 Lands (36) 1 Arch of Orazca $ 0.25 1 Auntie's Hovel $...