See The Blue Test for a UR Evergreen. Uncover... ain't great for evergreen I suspect. Let's try again. I was inspired by the loot of blue and rummage of red. An evergreen should probably be simple. Let's keep this just creature-based and include nothing referencing other card types, despite the allure of UR's love of instants and sorceries. Red likes damage direct, blue likes prevention. Those aren't touching. Blue, by liking instants and having flash, is fast. Red has some fondness for instants and things like lightning are evocative of being fast, oh, and haste and first strike. Shall we try for speed?
Fast1: Eek, that's a no.
Fast2: Well now, here's a weird hybrid of Reroute and hexproof's distant cousin twice-removed.