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
Whoa, hold on there, let's not get crazy
As the storm ceases, Ho-Oh flies above and drops a feather called a Rainbow Wing
That does not mean 100 different cards
Not background necessarily, but some other line of text that says something along the lines of Whenever you sacrifice a Treasure token, give a creature a +1/+1 counter and trample until end of turn. That would make it a lot more interesting and powerful, but I suppose not every card needs to be great