1: Fierce Guardianship This is lower if you dont have a commander that costs 3 or less mana and might be worse than Force of Will if your cheapest commander costs 3
Entrancing Melody is a touch slower than Id like, but if you can resolve it it is a game-changer against low-synergy aggro, and the Castle Vantress in the sideboard is there in order to up your land count so you can more reliably cast your Melodies
This is a pretty straightforward commander
For example, if an effect allows you to cast a permanent spell with mana value 3 or less from among cards in your graveyard, you could cast Bottomless Pool this way, but not Locker Room
If you wait until after the declare blockers step, because all combat damage is dealt at once, Kaito won't normally deal combat damage
The borderless copies of Summon: Knights of Round follow the same pattern