mtg syr gwyn commander deck EDH Deck Gwyn, Hero of Ashvale 100 Magic Cards Custom Deck Knights Equipment playmats enhance the gameplay experience Shield Deck Custom Knight Tribal

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

Deserts Matter This wont be Standard legal, but it looks fantastic for Desert lands

It's a mass of purple, with three screaming heads, split 'lips' that reveal gums and monster-sharp teeth, giant fungal puffballs within the center of each mouth, disturbing brain matter on the top 'jaw', a root network on the lower 'jaw'

Marcy: Lightning Returns

Glare of Subdual could be a techy card

Their perfect fit sealable are my favourite