mtg syr gwyn commander deck EDH Deck Gwyn, Hero of Ashvale 100 Magic Cards Custom Deck Knights Equipment a playmat also makes an excellent oversize mousepad for home or office. Syr Gwyn, Hero of Ashvale

Cavern of Souls Listed at: $28 Cavern of Souls is a flavorful card of The Lost Caverns of Ixalan because of its name, but its a reprinted card that debuted in Avacyn Restored

Glare of Subdual could be a techy card

Both also require you to already have something out on the board to use them effectively on and as a result he seems to be best suited to the mid range decks

Theyll go through your cards, one by one, and add up what theyre willing to give your for your collection based on their buylist

Marcy: Lightning Returns

While Im not sure if it truly makes the cut in cEDH, you could also cast Return the Favor to make your own copy of the enters-the-battlefield ability of Thassas Oracle to win on top of their ability on the stack