I suspect Polluted Cistern alone would already see play in EDH
As a ramp engine, sadly Relics of the Rubblebelt isnt all that, since only one Conjured Signet goes onto the Battlefield
(In fact, token cards have various effective rarities, but for card code purposes they are listed as a single rarity.) Yes, currently in Magic card codes there are seven options for the rarity field: C Common U Uncommon R Rare M Mythic Rare L Land (This refers only to basic lands
Youre not going to find any at Star City Games
Firstly, as a counter to enemy board-wipes, where it can essentially close a game by wasting a control players best answer along with their turn
Ive played enough Vampire decks to know how good this effect is, and if you can copy it, even better