Its a Commander variant inspired by the legend of King Arthur and Excalibur, where you pick a common creature to be your champion (commander) and a legendary Equipment to be its signature weapon
In the end, it seems like one of those cards that immediately stands up the hairs on the back of your neck, but upon further review doesnt seem quite as scary
Is it better? Nope it sure isnt Well is it at least as good? Nope! Is it in the vein of at least tap stuff down for no mana like Opposition? Nope! Is it a frustrating reprint in Blue of Winter Orb or Rising Waters? Nope! But you say its repeatable and an engine
And the Water Fortress has puddles everywhere
Fetchlands like Misty Rainforest are great ways to reset the top of your library to get a fresh look with The Fourth Doctor, but Id also recommend trying out cards like Bant Panorama and Shire Terrace which enter the battlefield untapped and tap for colorless mana in the early-game, and then you can cash in for a basic land and shuffle your library later when you need it
This card was released in the original Portal set from 1997 and features some stupendous art from Kev Walker