Increased Closing Power As this is a creature deck, its important to be able to close the game in short order, lest the slower value machines of the format overwhelm your floating friends
The light will either be completely blocked (card is too thick/dark) or it will glow a bright, fiery orange/yellow because the paper density is completely wrong
Sure, the mana can only cast creatures, but this isn't much of a drawback considering our deck is 30 creatures and six spells
Even the most powerful hate cards wont automatically show up in every opening hand and with the limitless potential of treasure fueling you, your opponents probably wont get that many more turns to find them
Penumbra Spider
While is pretty steep for a 5/3 creature, when it enters, its first chapter destroys target creature a foe controls, its second chapter is the your foe loses the game one, which is obviously awesome, and the third chapter draws you two cards and forces all players to lose two life