A passive way to inflict damage on an opponent is the Scourge of Valkas
(Look at the top five cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.) The Jeskai would have me bow in restraint
The majority of cards remaining in your deck should revolve around that theme or goal youve identified
Toski, Bearer of Secrets Fun fact: In senior year, Toski was voted Least Likely to be a Typal Commander. An indestructible, uncounterable commander is already really good, and the fact that it has to attack each turn means that it rewards you if you pile it high with auras, equipment, etc
He also turns all your top-of-deck tutors into immediately castable, often game-winning, cards