Card advantage is a strategic concept (rather than a specific game term) and a lot broader, and basically means having more cardboard than my opponents. For starters, any card that puts more cards in your hand is card advantage, even if it doesn't say draw. But card advantage also looks at what happens in other zones
Before we get into the ranking of all the shapeshifter commanders, lets touch on the similarities between the changeling mechanic and the shapeshifter creature type
She's a mere 4/4, but she's also got a rather powerful mind-control effect, temporarily resurrecting a creature she personally slew, and having that creature fight for you as long as she's around
But I love the way it works on Archon of Cruelty down to the red slash for the mythic on the set symbol
This is a synergistic background for a Abdel Adrian, Gorion's Ward so that you can blink the commander and create creature tokens in return for the nonland permanents you exiled as the commander entered
The fact that it only casts creatures and doesnt work on abilities makes it way more limited than it reads
