Machinist's Arsenal seems custom-built to synergize with Cid, as it's the only job select card that gives the artificer type
Of course, they could exert for other reasons and avoid having to challenge, but if you can get something big enough of your own exerted, your opponents characters will crash against it and take themselves out
Its hard to say which is more likely, but Im leaning towards the latter
Need to jump into action with colorless ETB cards, we have a list for that
Sword & Shield Silver Tempest pre-release events: Featuring Build & Battle Boxes with four booster packs and four available SWSH Black Star Promos, one random selection in each box
While most of these have triggers that require your deck to be constructed a very particular way to support, there are plenty of ubiquitously good options that can slot into just about any white Commander deck