I wouldn ' t do a 1 for 1 swap . I run 10 fetches currently . That ' s down from 11 with the printing of Spirebluff Canal . The fetches are important because we ' re looking to fill our yard for our expensive delve threats . edit Imagine the following line of play . T 1 fetch UB . Thoughtscour . 4 cards in graveyard T 2 fetch U or UR if you ' re color tight . 5 in graveyard . Cast Tasigur with Dispel backup . Or cast Gurmag Angler . This is the kind of play that wins the Ad Nauseam matchup or gives you game against Tron . end editThat said blue is more important than red in most shells so i ' d run Flooded Strand over Bloodstained Mire . Somthing like 4 Polluted Delta , 3 Flooded Strand , 3 Bloodstained Mire . The downside is not being able to fetch the mountain to bolt something . That said it shouldn ' t be a huge deal . These numbers change a bit if you ' re not trying to hit double blue for Vendillion Clique .