So you could spend five colorless mana to cast it, or one of each color, or literally a thousand different mixes of colored and colorless mana
Mill can also be a risky strategy because there are lots of good commanders that benefit from having their graveyards filled, so by milling them you actively help them in their own strategy
Another one that I know can be good in black reanimator is Emperor of Bones, although he has some unfortunate anti-synergy with other cards in the deck like Twilight Diviner
I hope he gets a lot more land artworks like this in the future
One of the other compartments is big enough for a standard, 60-card MTG deck and the third can hold dice and other tokens to aid in playing your CCGs
For instance: Creatures (21) Planeswalkers (2) Lands (22) Spells (15) By contrast, Colossal Dreadmaw is worse than Carnage Tyrant in 9.44 ways and shouldnt see play in Constructed anywhere