It can be useful in postboard games when topdecking Reunion can give you a much needed boost after opposing graveyard hate wipes your resources Cathartic Reunion and Thrilling Discovery The majority of times, both cards will do the same: discard two and draw three cards, resulting in dredging up to fifteen cards in the best case scenario
Seedborn Muse and Drumbellower make this Naya commander sing with value
Azusa, Lost but Seeking is a popular green commander, exploiting ramp synergies, big creatures, and it sees play in Modern decks like Amulet Titan
Then you can tap him for three to draw, discard, and then if it was an artifact, you can exile it and make an 0/2 Thoper artifact copy of that artifact with flying
Courtesy of Wizards of the Coast (WotC), check out the black mythic rare modal double-faced card from Zendikar Rising Agadeems Awakening
Much of the deck is dedicated to either discard effects like Bitter Reunion to help sculpt your hand or mill effects from new cards like Dune Chanter