There's also always the risk of not having enough follow-up to the Wire, or facing opponents who can cast their spells during upkeep, but often that is worth the risk
From a gameplay perspective, it's incredibly easy to get out, immensely oversized on the battlefield, and resilient to removal, since you can cast it from the graveyard
Zilortha takes the power and combat focus of Gruul decks and doubles down, giving that extra bit of survivability to your Dragonborn Champions and making cards like Cyclops of Eternal Fury playable
A similar card to this is Mirri's Guile, which also provides the same effect to rearrange your library but misses the card draw potential
Chilling Reign is a perfect example
Notably, Korvold will benefit from any Magic card type being sacrificed, not just Treasures, so the deck can also use sacrifice-related cards like Sakura-Tribe Elder