Crystal Poly

{x}{t}:Harden(Crystal Poly gets X +1/+1)
{x}:Decompose(Exile X permanents from any graveyard, Crystal Poly gets X +1/+1.)
{ut}Crystal Poly gains trample and vigilance until end of turn.
Other Roly Polys get +X/+X where X is how many +1/+1 counters is on Crystal Poly.