Pernicious Deed That is one deadly balloon payment
In this case, the chime is clearly represented with the bell and birds taking flight
Herald of Torment is a nice rounded little card that is far more playable on the cheap end than Boon Satyr and far easier to engineer playing as an aura as well
The Sideboard The cards in our sideboard are designed to do three things: help improve our matchup against aggressive creature decks (by far our worst matchup), fight three-mana planeswalkers (especially Teferi, Time Raveler but also Narset, Parter of Veils and Oko, Thief of Crowns), and answer graveyard-based decks (which we actually help by filling their graveyard with our mill spells)
The quickness and efficient nature of a commander like Isamaru will make nearly every game feel like an uphill battle for your opponents, as you will have immediate access to your commander
The mana is just so much better that way