Instead of just one Commander card, you can have two as long as the card has Partner. Combine Leonardo and Donatello to create a token +1/+1 counter engine that will make everyone else at the table lose their minds as you try to keep track of your board
Seven brand-new cards bring Sonic, Shadow, Dr
Cloudshift specifically returns the creature to the battlefield under your control, so the creature always enters under the control of the player who cast Cloudshift, where its no longer associated with the mind control effect that originally took it
To what end
Mnemonic Deluge (Correction - October 26, 2020 13:07 GMT: I totally missed that Mnemonic Deluge lets you use instants and sorceries from any graveyard, not just your own
There are other benefits to these spells that make them slightly better than a 1-for-1 exchange, but they do not put you up on cards or any sort of permanents in play, and are therefore not card advantage