Rune smasher

trample
{u/b}{u/b}{u/b}{u/b}: return this creature from the graveyard to your hand
{t}{x}{x} put x runes on this creature. (a rune counter gives this creature hexproof)
{u/b}{u/b}rune smasher gains +x/+x until end of turn where x is the number of runes on this creature counters on this creature