Forum:Neo space marine dolphin and NEX

Hi, as part of building my E-Heros deck, I picked up "neo space marine dolphin" without really bothering to read how to summon him....now that I have it, I'm completely confused by this "NEX" rule. Can anyone explain to me in plain english? Have I wasted my time with this card? Grateful for any advice! 86.185.158.213 (talk) 19:28, September 11, 2011 (UTC)