You want a focused tribal deck You prefer linear decks that play out similarly each game You find too much variety overwhelming You dislike inconsistency Choosing Your Commander My original primer had Morophon, the Boundless as the deck's commander, and it's still a great choice: it's a changeling so it's the most thematic choice for a changeling deck, it offers powerful ramp and is a key piece to enable various combos, and its 5C identity allows you have to maximum flexibility on how to build the deck
Combined with Artist's Talent, you can draw and discard a bunch of cards every turn, and deal a lot of damage to your opponents
For example, if a decks highest cost card is 7, players may want to make sure there are at least some cards in each of the costs from 1-6
Alongside the main set comes a series of Commander preconstructed decks designed for immediate play
Especially given the presence of cards like Dark Ritual, four is easier to hit, and even in fair decks, that one turn really does make a large difference. That took care of Aarakocra Sneak, Stirring Bard, and Vicious Battlerager
It's also important to consider that not every recursive creature needs a payoff