Not only did the name mean "looking back at the past," it had a mechanic that referenced cards that had already been played
Karoo actually lets you produce more mana with the same number of lands by returning one of your Plains to your hand, and lands like Buried Ruin can help retrieve a mana rock or another key artifact lost early in the game

Advanced Search Sets Random Syntax Ba Sing Se Blinkmoth Nexus Cactus Preserve Cave of the Frost Dragon Cavernous Maw Celestial Colonnade Creeping Tar Pit Den of the Bugbear Dread Statuary Faceless Haven Faerie Conclave Forbidding Watchtower Frostwalk Bastion Ghitu Encampment Great Hall of the Biblioplex Hall of Storm Giants Hissing Quagmire Hive of the Eye Tyrant Hostile Desert Inkmoth Nexus Island of Wak-Wak Lair of the Hydra Lavaclaw Reaches Lumbering Falls Maze of Ith Mech Hangar Mishra's Factory Mishra's Foundry Mobilized District Mutavault Nantuko Monastery Needle Spires Raging Ravine Restless Anchorage Restless Bivouac Restless Cottage Restless Fortress Restless Prairie Restless Reef Restless Ridgeline Restless Spire Restless Vents Restless Vinestalk Shambling Vent Skycoach Waypoint Sorrow's Path Soulstone Sanctuary Spawning Pool Stalking Stones Stirring Wildwood Svogthos, the Restless Tomb Treetop Village Tyrite Sanctum Wandering Fumarole

Rarity: -Common: 42 types -Uncommon: 28 types -Rare: 23 types -Super Rare: 12 types -Ultimate Rate: 3 types -Secret Rare: 2 types -Special Card: 5 types Product Configuration: - 12 Cards per pack - 24 Packs per display - 12 Displays per case
Again, not necessarily a Bird lord per se, but still great in (bird pun incoming) dedicated Bird shells
Zabaz, the Glimmerwasp Zabaz, the Glimmerwasp is an interesting modular Commander card