Solid Rocks Trinity ETCO

Strengths: 

Union Carrier lets you play the grind game with many other explosive decks

Block Dragon is a great advantage maker that lets you tool box your entire deck and its protection helps push through boards.

Has a very high ceiling when you open power cards such as Brilliant Fusion, Last Will, and Adamancipator excavations

Can stun very well with Ties of the Brethren and Koa'ki Meiru

Weaknesses:

Can open very bricky hands (Solid Bricks)

Very GY depended deck; Called by and Cosmic Cyclone hurt the deck a lot

Trinities:

2x Last Will (Extra Unlimited Card)

2x Brilliant Fusion (Extra Unlimited Card)

2x Adamancipator Researcher (Extra Unlimited Card)

Comments:

Union combo is summoning Union Carrier while you still control a Rock-type Monster and equipping Block Dragon from the deck

The deck can do unfair plays such as ending on multiple Xyzs/Synchros if you get luckly with the Adamancipator

Beta The Electromagnet Warrior is a 1 card Berserkion the Electromagna Warrior with 1 pop on summon (takes 2 turn)

1. Normal Beta, Search Alpha The Electromagnet Warrior


2. On the opponent's turn use Beta to tag out into Delta The Magnet Warrior, use its effect to foolish Gamma The Electromagnet Warrior


3. On your turn summon Alpha search Berserkion, banish Gamma, Beta, Alpha from the field/gy to summon him from hand and banish Delta to pop a card (not once per turn)

The Side decked rocks are all searchable with Gallant Granite and can be summoned with Super Team Buddy Force Unite!

Doki Doki is also a recruiter that summons from deck, with a low cost and can be used as an extender

Brilliant Fusion doubles as a free body as well as a foolish for all rocks/Painful Decision

Ties of the Brethren works as a combo finisher (at the end of Union Combo) or as a stun option (worth spending Trinitys on if you want to toolbox)

Last Will helps with Union Combo and toolboxing from deck

Adamancipator Risen - Dragite is a blowout card that can break boards (and gains protection form Block Dragon)

Barrier Statue of the Drought + Koa'ki Meiru Overload is to much for most non Earth decks to handle, and you can turn off your own Barrier by turning it into Gallant