The creature tokens that Bladewing, Deathless Tyrant makes are fantastic, as 2/2s with menace are annoying to block, especially when combined with spells and permanents that give them higher stats
Her Activate: Main ability lets you draw one card once per turn after activating an Event with a base cost of three or more during that turn, keeping your hand stocked as you burn through resources
This ones a reprint, but its really powerful, and Commander players love it
A creature that similarly pumps the team on each other creature ETB has extra layers of synergy with Mentor of the Meek and other creature or human payoffs
Many commanders like The Gitrog Monster give you tips about what they want, usually by calling out specific card types, zone, or game actionsother similarly simple commanders include Isshin, Two Heavens as One, who demands attack triggers, and Atraxa, Praetors' Voice, which needs some sort of counter to proliferate