I feel like this is good, but I’m struggling to think about what deck would run it. Mono-Green Nykthos in Pioneer? The mana cost on the untap ability makes it useless for mana ramp unless you’re tapping for multiple mana, and the search can filter your hand but you need a really good target or dead cards you want to trade in.

Just seems like a strange combination of abilities for a World Champ card I usually assume is aimed at competitive