It makes all your colorless creatures +2/+2 larger, gives you more colorless mana every time you tap for it, and also refills your life counter every time you cast a colorless spell
Notably, a discovery counter causes the card to go back to the graveyard if it's removed
The reward for his betrayal, however, is powerful
The lands we play with her should get exiled if they go back to the graveyard, but we can respond to the exile trigger, bring the lands back with some of our instant-speed recursion, and we won't have to exile them
1 Tainted Observer
Take a look at the entire Commander deck below: Creatures (37) 1 Crystalline Sliver 1 Winged Sliver 1 Clot Sliver 1 Shifting Sliver 1 Blade Sliver 1 Synapse Sliver 1 Brood Sliver 1 Quick Sliver 1 Crypt Sliver 1 Hibernation Sliver 1 Bonesplitter Sliver 1 Firewake Sliver 1 Gemhide Sliver 1 Harmonic Sliver 1 Might Sliver 1 Two-Headed Sliver 1 Necrotic Sliver 1 Sinew Sliver 1 Bonescythe Sliver 1 Blur Sliver 1 Sentinel Sliver 1 Striking Sliver 1 Megantic Sliver 1 Galerider Sliver 1 Syphon Sliver 1 Manaweft Sliver 1 Constricting Sliver 1 Sliver Hivelord 1 Diffusion Sliver 1 Venom Sliver 1 Lavabelly Sliver 1 Hollowhead Sliver 1 Cloudshredder Sliver 1 Spiteful Sliver 1 Cleaving Sliver 1 Realmwalker 1 Sliver Gravemother Lands (46) 3 Forest 2 Plains 2 Swamp 2 Mountain 2 Island 1 Rocky Tar Pit 1 Mountain Valley 1 Grasslands 1 Flood Plain 1 Jungle Shrine 1 Savage Lands 1 Seaside Citadel 1 Exotic Orchard 1 Command Tower 1 Nomad Outpost 1 Mystic Monastery 1 Sandsteppe Citadel 1 Opulent Palace 1 Frontier Bivouac 1 Prairie Stream 1 Sunken Hollow 1 Smoldering Marsh 1 Cinder Glade 1 Canopy Vista 9 Wastes 1 Ash Barrens 1 Irrigated Farmland 1 Sheltered Thicket 1 Scattered Groves 1 Path of Ancestry 1 Unclaimed Territory 1 Secluded Courtyard Spells (17) What do you think of the Sliver Swarm deck
