Yes, as a five-mana enchantment, this is a bit costly, and it would be ideal if it could get into the game much earlier, but given how out of control the counter generation can get, don't overlook that this could be used more for its haste aspect than the counters
Only downside is, if you're not in a spot where you can attack, both sides are pretty underwhelming
Its one of the best forms of interaction blue has in Commander, and most blue mages include a copy in their deck
Players can use the guides to easily catalog their cards by set
Since Chaos Rising is such a new set, the value of its chase cards is volatile at the moment, but it does contain one major chase card that most collectors are going to want