"[Mangara] is hands-down the best card-drawing commander mono-white has ever gotten. Also, he’s got tons of upvotes on Reddit, which has to count for something." Nope. Turns out it doesn't. Mangara's biggest problem is that he only does one thing. Like, if he submitted his resume...
Colossal Majesty continues the long tradition of green enchantments that generate card advantage e.g. [card]Elemental Bond[/card]. While I have seen a lone few commenters on Reddit compare this to [card]Phyrexian Arena[/card], I don't think that comparison holds up. I like Colossal Majesty...