Arkbane

Hexproof
{t}: Add a Hero counter to Arkbane
{r/w},{t}: Put a Dagger token into play with Wield
damage equal to each Hero counter.
{r/w}{r/w},{t}: Add an attack counter to target Weapon
for each Hero counter.
{r/w}{r/w}{r/w},{t}: Search your library for a Weapon
artifact with converted mana cost equal to the
number of Hero counters and put it into play Wielded, then shuffle your library.