Find a way to summon Painter Snow.
Set up Rainbowed Canvas, and summon Aurora to protect your back row.
Try to get a lot of Weather magic/trap cards in your back row.
Summon Cloud, get Metaltron XII with Dragonic Diagram, or by drawing it.
Use a monster tribute (NOT CLOUD), 2 Weather Traps, and Magic tributes.
You will get a boss monster unaffected by everything (he can still get fucked by Kaiju/Lava Golem and Battle), if he gets eventually destroyed in battle you will get to summon a free synchro/fusion monster of your choice. Get what you need at this moment.
When your Metaltron XII is summoned use Cloud's effect to recycling the trap/magic cards used for his summon.
You can then try to stall a little with Rainbowed Canvas / Snowy Canvas to get a lot of Weather monsters on the field before summoning Rainbow.
Use 2 weather magics/traps and one Weather monster again (NOT CLOUD).
Cloud will recycle the magic and the trap card.
Ta-da, Rainbow: 3+ omni negates each turn. (4 if you use Rainbowed Canvas)
+ A big beat stick body unaffected by everything (The Weather Archetype lacks offense power) who can get you another omni negate if he gets destroyed.
The rest of the deck is for searching, stalling, etc..
Have Fun :)
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