Junk Synchron is a Level 3 Tuner that, when Normal Summoned, allows you to Special Summon a Level 2 or lower monster from your Graveyard. How do I get a Level 2 or lower monster there in the first place though? You don’t have to worry about that because, thanks to What Grows in the Graveyard, you will begin the Duel with a copy of Dark Verger in your Graveyard.
Use Junk Synchron and Dark Verger to Special Summon Armades, Keeper of Boundaries; Dark Verger will be sent to the Graveyard again, ready for your next turn.
Armades is a Level 5 Synchro that is able to prevent your opponent from activating cards or effects until the end of the Damage Step if it attacks or is attacked; your opponent will not be able to use Sphere Kuriboh, Drowning Mirror Force, Widespread Ruin and Wall of Disruption, but you will still have access to your own Spell & Trap Cards.
A generic Level 7 Synchro that, once per turn, can destroy Field Spells active on both sides of the field and make you gain 1000 Life Points. Ancient Fairy Dragon is an interesting answer to Vampire Kingdom and Fire King Island.
You can use Paleozoic Canadia and Enemy Controller to slow down your opponent or to make aggressive plays. You can Special Summon Paleozoic Canadia from your Graveyard as a Level 2 monster by chaining it to another Trap Card and then either use it to attack your opponent or as Synchro Material.
I was tempted to write "Moderate" because you technically "only" need Junk Synchron and Armades in order to play the deck. From now on, the "Cost" section will refer strictly to the "Essential Cards". I already know I'm going to get a lot of "How is this deck moderate wtf?!".