As far as I can tell, theres only one other card with that ability, and it stinks
G3 Im able to keep his board pretty clean and have a Psychatog chipping away, but without lethal yet
If you could only get one mana per turn from this guy he would still be good and so his interaction with sac lands and other effects that can net you vast amounts of mana really push him over the edge and offer some great fun god draws
The fixing aspect helps enable multicolor lists, which human decks often leverage well
I count: 38 lands and The Balrog of Moria (kinda), Treasure Nabber, Arcane Signet, Basalt Monolith, Commander's Sphere, Everflowing Chalice, Mind Stone, Relic of Sauron, Sol Ring, Worn Powerstone, Shiny Impetus, Cavern-Hoard Dragon 50 mana
Some nasty players put dredge to work to prove just how lost you can get in the swamp that belongs to The Gitrog