Telim'Tor could no longer recall the exact number of assaultsbut his troops could

Aeronaut Tinkerer Aether Chaser Aether Herder Aether Inspector Aether Poisoner Aether Swooper Ambitious Aetherborn Argivian Blacksmith Aspiring Aeronaut Automated Artificer Aviary Mechanic Aviation Pioneer Bastion Inventor Beamsaw Prospector Carapace Forger Cloudsculpt Technician Countless Gears Renegade Daring Mechanic Defiant Salvager Dispersal Technician Erebor Flamesmith Etherium Sculptor Faerie Mechanist Gadget Technician Gearsmith Prodigy Ghirapur Gearcrafter Glint-Sleeve Artisan Goblin Tinkerer Highspire Artisan Ingenious Artillerist Inspired Inventor Inventive Wingsmith Kenku Artificer Maul Splicer Maulfist Squad Meticulous Artisan Myrsmith Nimble Innovator Nimble Thopterist Oltec Archaeologists Oxidda Daredevil Peema Outrider Powerstone Engineer Propeller Pioneer Quinjet Technician Reckless Fireweaver Renowned Weaponsmith Sage of Lat-Nam Scholar of Stars Selfcraft Mechan Sensor Splicer Sweatworks Brawler Tomakul Scrapsmith Towashi Songshaper Vedalken Engineer Voyager Quickwelder Weapons Vendor Weftblade Enhancer Weldfast Wingsmith

The card itself was part of a cycle of five cards that were designed the last minute around unused art (Sedge Troll, Birds of Paradise, Island Sanctuary, Stasis, and Word of Command) by Garfield himself
Instead of putting the basic lands on a separate print sheet like they do now, they mixed them in with the other cards
Exploration is one of the most well-known Lands cards
It accumulates counters any time one of your Birds goes down, and buffs your Birds in play for each counter it has