Activate Lightning Vortex and discard Castle Gate. Return him to the field in defense position with monster reborn. Equip him with Ring of Magnetism. Activate Jam Breeding Machine and activate Mass Driver. Jam Breeding Machine will summon tokens, and the Mass Driver will use them to burn your opponent. With JBM you won't be able to summon other monsters, so Castle Gate with RoM is a nice defensive tactic. (It's also good versus piercing attacks.)