Doubling your mana puts you leaps and bounds ahead of your opponents, especially considering that this excellent green planeswalker protects itself and pressures your opponent by animating lands
Honorable Mentions Kinjallis Caller / Otepec Huntmaster / Intrepid Paleontologist Dinosaurs, being apex predators in their day, are rather expensive when it comes to casting them for full mana value in Magic
Even an entire set built around vehicles couldnt change that

Badgermole Cub - the best new card Sol Ring - the best Commander card Craterhoof Behemoth - the best go-wide finisher Gaea's Cradle - the best land you can actually play The One Ring - the best artifact Griselbrand - the best reanimator target Swords to Plowshares - the best targeted removal Urza's Saga - the most value from one land Lurrus of the Dream-Den - the strongest mechanic Pack Rat - A limited powerhouse Oko, Thief of Crowns - the best planeswalker Contract From Below - technically disqualified Tinker - the best MTG tutor card Deathrite Shaman - the best mana dork MTG card Brainstorm - the best card draw spell Cyclonic Rift - the best blue boardwipe Mishra's Bauble - the best free spell Teferi's Protection - the best protection spell Esper Sentinel - the best one drop Orcish Bowmasters - the best hate bear Blasphemous Act - the best red board wipe An Untapped Island - the scariest card to face How we chose the best MTG cards 1

This is true of Collector Boosters as wellCollector Boosters are the best way to collect these variant rares and mythic rares in both traditional foil and non-foil, and they're the only place to collect extended-art cards
You have to build around Bahamut, making sure you can either cheat it out or reliably get to 9 mana