You cant really go wrong, as such, but consider ease of casting and the density of power three or four creatures, and then density of token production
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Urtet is a 2/2 for 3 generic mana that creates a 1/1 Myr artifact creature token whenever you cast another myr spell
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No, but please be aware that the question shouldn't be about anything that your opponent(s) would find objectionable
Just overpowered, through and through
