you by no means need creatures. i have created several builds without creatures. i would recomend a battleforge or two to beef out your equipment fast. use elemental wand, and circle of lightning in case they do have a swarm.
even without creatures you need a way to fight someone who does. if your going all out attack dont worry about killing creatures go straight for the mage. its not just the cards its how you play it.
you could also consider heavy melee equipment on top of the spells, if someone is hindering your spells, go melee, if someone is hindering your melee, go spells.