Bolt Strike is a powerful electric type move that will benefit from STAB (Same Type Attack Bonus), Dragon Dance is a powerful setup tool, Dragon Claw also benefits from STAB and covers a lot of the other dragon types found in Uber, and Substitute/Roost will help Zekroms survivability
Loxi: I think cards like this are pretty slept on in Commander: lots of players will fully tap out in the early-mid game, especially to play expensive ramp spells
Now, as thinking if this from a player standpoint, Im actually kind of excited I can pick up a lot of stuff I need for modern, with new art, for super cheap
Even lightly played (LP) copies can hit highs in the $120 range, while an NM copy of the standard holo commands closer to $40
Detain is considered one of the lowest-power mechanics from a Ravnica set, as its narrow applicability means it needs to appear on valuable creatures and permanents