Because it's 5 mana for a 3/4 that has to make a full turn before it can be activated normally. Actually making the first nexus 8 mana. After that...if it survives, you do get some decent value though.
September 15, 2018 9:42 a.m. Edited.
I’m not much of a standard player but Overflowing Insight would allow for a player to always find their nexus.
September 15, 2018 6:53 p.m.
Am I getting something wrong with adept? The spell still resolves and is put into the graveyard, except when the spell says different. So you don't just cast a copy, you cast the spell. Which means you'll still have to find nexus to cast it over and over again. Apex of Power might actually be more interesting with adept.