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That search intent is more precise than a general Evolving Skies booster search

Burglar X EARTH Level 3 [ Beast / Normal ] ATK 850 DEF 800 A sly rat

Oloro, Ageless Ascetic Isnt eminence fun

In Magic, there are Waterbreathing creatures (that use mana to gain +x/+0), and White has the odd one kicking around (I think every colour does ultimately), you could throw something like that on

You can find similar effects in Mishra, Claimed by Gix, Commissar Severina Raine, and Brutal Hordechief

Im not going to pretend that Commander is a pauper format or anything, but due to its very nature, you can get along quite nicely on a shoestring if you want (or have) to