The reality of grading is if the card looks like a 10 to the untrained eye, its probably a 9 or lower
Even if Kaito's triggered ability triggers more than once in the same turn (perhaps because one or more attackers had first strike, multiple players were dealt combat damage by your creatures, or there were multiple combats), and you return an attacking creature to hand each time, you won't be able to activate Kaito's loyalty abilities more than twice that turn
These freeze effects that prevent creatures from untapping, which almost always tap them in the process, rarely ever cost more than 4 mana
You want it to be cheap to disrupt your opponents as soon as possible
Given were in Blue and White, we have plenty of ways to keep our generals in play, too from counterspells to cards like Teferis Protection