Odd place to put a color hoser, but it could be a decent response to what is probably a removal spell (if it's your turn) or more board presence. Maybe there's a cycle for this?
Quite a lot of decks in Modern are part blue and/or black (e.g. UR Murktide Tempo, BG Yawgmoth, 4-5c Elementals Midrange, Living End, Underworld Breach variants, Jund, Indomitable Creativity, Rakdos Scam, Crashing Footfalls decks), so this has promise there. Possibly the biggest decks making this a mere 4/2 with Flash for 3 mana are Burn, Amulet Titan, Mono-Green Tron, and RG Valakut.
Source: TheAsianAvenger