This is definitely an option, but to put it in the words of people in discussion guides across the interwebs: You are playing with 2 half decks each playing at half potential. While this is true, it is also kind of interesting because the Nekroz help to make up for poor U.A
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Where most Mega ex SIRs in this era reach for scale and aggression, Teeziro goes the other direction, being soft, luminous, and quietly stunning
Theres also synergy with permanents that sacrifice themselves - you can sacrifice a permanent after this spell resolves to exile it
and MTG binders to store collections in the most beautiful way possible
But once you have threshold, you have the single best card on the list