The letters describing Magic: The Gathering card rarities and their meanings are as follows: C common U uncommon R rare M mythic rare All of these parts make up the basic idea of what a Magic: The Gathering card is supposed to be
That's an all-timer of a Top 8 surprise, and it sets up a memorable Sunday stage
Almost every Ragavan, Nimble Pilferer deck plays the two-mana sorcery alongside it, as the more mana you can create, the better Iteration is as it is not being forced to take lands from it/having the mana to be able to cast any card you hit makes Iteration closer to a two-mana spell that draws two of the top three cards, which is utterly broken
Hypothetical goblin cards being released in the future is not justification for a ban now, either
Generally, whenever you need a mono-color deck to do something that its color can't really do, try this: use artifacts and other colorless cards to do stuff your color can't (try searches like colorless + "destroy" + "permanent")