@Trippie:
Spiaghi is pretty damn awesome because not only does he reduce quite a fair amount of damage with the lowest minimum possible at only 2*; he also has 7 power and the
Montana bonus. Oh, yeah, the 2* thing. You totally underestimate it. 2* means that he can be played in virtually any T1,
ELO or DT T2 deck. And I mean virtually any deck and not just
Montana based decks since his high power and his high reduction is worth splashing into pretty much anything.
Can't really do that with Tana, Graks,
Marina... you name one...
Of course, if you wanna go into T2 then he isn't useful enough since there are enough high starred DRs around that are worth picking.
But if you wanna base it purely on ability instead of versatility, then its Graks followed by
Uranus of course.