Sky Striker, Linkage!

As an additional cost to cast this spell, sacrifice a creature.
Search your library for a creature card with
converted mana cost equal to the sacrificed
creature's converted mana cost with a different
name, put that card onto the battlefield, then
shuffle your library. If a Machine or Warrior
was sacrificed this way, that creature enters the
battlefield with two additional +1/+1 counters
on it.