Dynvu, Exiled

Dynvu, Exiled's power and toughness are equal
to the number of ION creatures you control.
{w/b}{w/b}{w/b}{w/b}, Sacrifice Dynvu, Exiled: Return all creatures from your graveyard to the battlefield
that died this turn. If Dynvu, Exiled is put into
the graveyard from this effect, put him on top of
your library.
"Who am I? What have I become..."