While Mishra worked with the desert nomads of the Fallaji Empire, Urza gained power in Yotia
However, you can't change the target to an illegal target
This one, however, is an exception in my mind, however, and is just as gorgeous as your typical character alt art
The wizard giant deals (X) damage to any target upon entering the battlefield, where (X) is the greatest number of creature you control of a common creature type

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In general, I would look at these two factors when looking to include cards not of your tribe's creature type: Is this creature so strong that it, on its own, is generally stronger than my tribal creatures when they are receiving bonuses and/or empowering my other cards