You may discard up to 4 Energy cards from your hand, and this attack does 40 more damage for each card you discarded in this way
Crested Sunmare is a little bit pricey, but its so easy for it to generate 20 power per turn cycle in this deck that its worth the consideration
Proxy Liliana of the Dark Realms from @TheProxyGuy on Twitter, also clearly marked "not for sale" The TLDR is that if you want to use proxies for unsanctioned play, that's great
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Notably, Zethi only works with instants, so no need to balance the number of sorceries you play in the deck
At the end of the Battle Phase, if this card battled: Inflict 2000 damage to your opponent