Vati, Story and Teller

Changeling, Choose a Background for each
commander creature or planeswalker you own.
Partner with up to 3 creatures or planeswalkers.
They needn't have the partner mechanic or be
legendary and can only be cast while you control
Vati. They gain, "If you do not control Vati,
Story and Teller, Sacrifice this permanent"
You may play saga spells from any graveyard.
Details change. The story remains.