Making copies of permanents that generate energy (like Whirler Virtuoso) doesnt even tax your energy that much
Even then, this is typically to make the most of Awakening of the Sacred Beasts or a Phantasm Fusion
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Theres certainly an argument for All Is Dust, although youd have to time it
Skithiryx, the Blight Dragon Commander Regenerate One of the best commanders with the regenerate keyword action, [c]Skithiryx, the Blight Dragon[/c] is an impressive 4/4 creature with flying and infect
Once again, this cards value is driven a lot by how rare it is
