Vanilla Synchro Swarm

A Vanilla Synchro Swarm is a deck that abuses low level normal Tuner Monsters and Level 3 and lower Normal Monsters. With most Spell Cards and Trap Cards being able to Special Summon back the monsters from the graveyard, the deck could be Turbo Synchro swarm deck. Besides the tuner monsters in the deck being the most important, the next most important card in this deck would be Enchanting Fitting Room which quickly swarms the field and thins the deck faster without penalizing yourself.

The Extra Deck mostly contains Level 5 to 6 Synchro Monsters or if one feels more adventurous a few higher level Synchro Monsters but will cost more Monsters to summon, but can be dealt with Instant Fusion if one wants to. Or another option taking control of the Opponent's monsters with cards like Creature Swap or Creature Seizure.

For the Side Deck mostly it's up to the person, but a good suggestion would to use cards to penalize the Opponent using Effect Monsters and high level monsters. Such as Skill Drain, Grave of the Super Ancient Organism, or Destiny Hero - Plasma.

As for Normal Monsters there a two options that could be made, if one wants to make a Semi-Beatdown Deck than run high attack Level 3 Monsters. Or if one prefers going on the defense then their are some Level 1 to 3 Normal Monsters that have high defense.

Tuner Monsters
 * Flamvell Guard
 * Genex Controller
 * Tune Warrior
 * Water Spirit

Semi-Beatdown
 * Atlantean Pikeman
 * Dragon Zombie
 * Hunter Dragon
 * Jerry Beans Man
 * Mad Lobster
 * Sonic Duck

Defensive
 * Acrobat Monkey
 * Charcoal Inpachi
 * Chamberlain of the Six Samurai
 * D.D. Trainer
 * Giant Soldier of Stone

Spells
 * Creature Seizure
 * Creature Swap
 * Dark Factory of Mass Production
 * Enchanting Fitting Room
 * Faustian Bargain
 * Heavy Storm
 * Natural Tune
 * Order to Charge
 * Silent Doom
 * Swing of Memories

Traps
 * Attack of the Cornered Rat
 * Birthright
 * Curse of Anubis
 * Common Charity
 * Cry Havoc!
 * Justi-Break
 * Soul Resurrection

Synchro Monsters
 * Any Level 5 to 6 Synchro Monster without summoning restrictions
 * 2 or 3 Level 7 or higher Synchro Monsters