13 Forest
4 Island
1 Overflowing Basin
4 Swamp
3 Oasis Gardener
1 Observed Stasis
1 Ochran Assassin
2 Omen of the Dead
2 Omen of the Hunt
1 Ominous Seas
1 Ondu Giant
3 Opaline Unicorn
3 Open into Wonder
1 Open the Graves
2 Oracle of Tragedy
2 Orazca Relic
1 Orcus, Prince of Undeath
3 Origin of Metalbending
4 Ornamental Courage
1 Ouroboroid
1 Outland Colossus
4 Overgrowth
1 Overrun
1 Overseer of the Damned
Sideboard: