They're also great in decks that can cheat the overcosted cmc that the spell sides are packing, like Narset, Enlightened Master and Golos, Tireless Pilgrim
And as long as there's no effect in play (like for example Karn, the Great Creator) that prevents you from activating abilities
The surface may have lost its original color and gloss, or have significant discoloration
Then you look at cards like Pitiless Plunderer, Vengeful Bloodwitch, Mirkwood Bats, Peregrin Took, Chatterfang, Squirrel General
Im not listing these because I think we should play them, I just wanted to share my suspicion that Tarkir is the world thats going to get devastated by the Eldrazi at some point to later turn into Zendikar, what with the references to Ugin and the hints at future colorless matters cards in parallel to Eye of Ugin in Worldwake
If you dont want your opponents creatures, yours still receive some insurance against effects like Path to Exile and Deadly Rollick, which can be extremely helpful if a creature like Avacyn, Angel of Hope is holding the rest of your board together