If you don't have money for upgrades, but you still want a solid rainbow deck...
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4sa 4sa 4sa 4sa 4sa 4sa 4sa 4sa 4sa 4sa 4sa 4sa 4sa 4sa 4vh 4vm 52n 55r 55r 55u 58v 5c1 5fa 5i5 5i5 5lf 5oj 5rn 5up 61r 8pj
I came up with this deck after wanting a rainbow deck, but i wasn't able to upgrade all of those cards, and didn't want to grind for hours and hours
The basic strategy is to play your boneyard as fast as you can, devour weak creatures, and use growth w/ the fire eaters and golems. Use PU on a strong creature whether it is yours or the enemy's. Use steal or pulverizer to defend against permanents. I'm thinking of exchanging Chrysaora's for two lightnings for creature control.