Heck, you could Sneak Attack it into play and attack on turn 4 (or earlier)
A 5/4 with trample, it blows up nonland permanents at random when it enters or diesor a guaranteed permanent in 1v1
By simply casting non-creature cards alone, you already gain extra bodies and fodder with this in play
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If you flip a second Illuna, you can add it to hand and then mutate it onto the first one for a double trigger (and no legend rule!) Its harder to see exactly what to do with Vadrok, Apex of Thunder , since one of the best spells in Jeskai to recast Deafening Clarion will also kill Vadrok unless you mutate it under something with better stats