Copying equipment, auras and counters is sweet, and having a Flying Lifelink creature with an annoying Ward cost goes a long way to making her playable
Making great effect of Enchantress cards, those that cause a player to draw cards whenever they play an enchantment, enchantment decks are often able to create impressive board states while never running low on cards
If we want to be more specific, we need to think about more than just our Commander: specifically, what is our deck trying to do , how does our deck function , and what is the curve we've got
Mishras Bauble is a bit more specific than a lot of my entries in this series, but the card supports a fairly wide range of things and exemplifies what I like in a colorless spell very well
Legendary Creature - Assassin Gorgon Winding Constrictor If one or more counters would be put on an artifact or creature you control, that many plus one of each of those kinds of counters are put on that permanent instead