Late game black often loses with action/answers in hand simply because it is the wrong time for those cards
Jeskai Flashback: Jeskai Flashback seems like it can be upgraded into a reasonable control deck, although it comes with a lot of risk: if your opponents play graveyard hate (and most experienced Commander players have learned that you should try to fit at least some into every deck), you could get locked out of the game altogether
When blocked by multiple creatures, an attacking creature can share its damage among multiple blockers - potentially defeating multiple blockers with a single attack
Rebbec, Architect of Ascension Rebbec, Architect of Ascension is an artificer that loves to build decks
Tapu Thunder GX does 50 damage for each energy attached to ALL of the opponent's pokemon
3 mana is a much bigger ask than 2, but its still a perfectly acceptable rate especially in a color starved for mana ramp options