When Normal Summoned, this Level 3 Tuner allows you Special Summon a Level 2 or lower monster from your Graveyard. Thanks to What Grows in the Graveyard, you will begin the Duel with a copy of Dark Verger in your Graveyard, so Junk Synchron will instantly give you access to your Extra Deck without having to set up first.
Junk Synchron and Dark Verger can be used to Summon any of the Level 5 Synchros in your Extra Deck, but most of the times you will want to directly into Armades, Keeper of Boundaries.
When Normal Summoned, Mystic Macrocarpa Seed will trigger Dark Verger’s effect from the Graveyard and allow you to Special Summon it to your side of the field in Attack Position. Now you have a Level 3 Tuner and a Level 2 non-Tuner, just like with Junk Synchron, but, due to the restriction that Mystic Macrocarpa Seed imposes, you will only be able to Special Summon an EARTH Level 5 Synchro from your Extra Deck.
A reason why I particularly like Enemy Controller in this deck is Spellbook of Fate: if your Dark Verger is banished as soon as it hits the field, you will get no value out of it and you won’t have access to your Extra Deck for the rest of the duel. You can chain Enemy Controller to Spellbook of Fate and Tribute Dark Verger.
As long as Dark Verger is in your Graveyard and you still have copies of Junk Synchron or Mystic Macrocarpa Seed in your hand or Deck, you will be able to retrieve it, so it’s the best card to use for your aggressive Enemy Controller plays.
Paleozoic Hallucigenia can halve the ATK and DEF of a face-up monster on the field, it can be used during the Damage Step to protect your monsters from an attack or even to allow them to get over an opponent’s monster.
Goyo Chaser synergizes very well with this card because of the fact that, unlike Mirror Wall, it can be used offensively. Just like Paleozoic Canadia, Paleozoic Hallucigenia can be Special Summoned from the Graveyard as a Level 2 monster with 1200 ATK.
Gamea, perhaps the second paragraph on Macrocarpa Seed's part could have been explained or separated more clearly, as right now it sounds as if you tell people that Junk Warrior is somehow an alternative synchro you can summon with Seed besides Goyo Chaser, even though you're well aware it cannot at the start of the paragraph.
I agree, that's a good idea. It's probably your best out to Yubel, but I don't know how you will be able to Summon a Level 3 Tuner in addition to your Level 5 Synchro. Yubel wipes the board every turn, so you are not going to be able to do that.