I use a similar deck...
4 successful farms on 4 attempts so far.
AI doesn’t seem too agressive with only cloudians on field.
You have to be lucky enough to draw ra before opponents decks out.
Use any Cloudians with protection from battle. Focus Acid Cloud for it's ability to destroy back row. Stall and overhead until the last turn, then summon Ra and attack. I would replace AMA with Arrivalrivals just in case Yami clears a monster away right before your last turn.
2/2 so far with this farm, thanks, only issue is he’ll deck out before you, luckily i had Ra and 3 monsters on the field before so i was able to summon him with enough attack points. this deck won’t be consistent but it’s the best so far. 6K-8K you can get with this farm
Anoymous
Virtus
