You don't want to exile more than one creature at a time with the Tomb but more importantly you don't want to exile that many of your cards
However, we can roll the planar die as many times as we want on our turn - but with a small catch: the first roll is free, the second will cost 1 generic mana, the third one 2 generic mana, and so on
Echoes of Eternity Eldrazi are doing odd things, and even their enchantments are strange, for example Echoes of Eternity
There were only three cards that received serialized versions in the set, and all three of them were borderless versions of three new Eldrazi titans
While the Vampires and Wizards added a color in them for Commander that hadn't existed before, they weren't brand new directions for the tribes, just bringing together synergies that were already there
This ability is useful for several reasons