screenshot of a scryfall deck and tiny format proposal
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With this deck, just recurring the spells, playing them to suit yr tastes and slowly wandering through the depths of Phandelver is enough to make Shu Yun punch for plenty. Breakthrough is of course broken under the rules but it's a $0.25-kinda broken which should be embraced, and besides, you can only cast it once a turn unless you stack treasures with Phandelver delves. I thought about putting in Ancient Animus but have not yet decided (as a rules council of one) whether fight effects can be ignored; your legendary guy is usually supplying the damage but the fight's impetus was external, so huh!
You can of course assemble decks around legendaries that AREN'T combat-oriented, but I think this needs a gladiatorial feel
edit: also not every deck would need to recur its graveyard this much; you could definitely build a machine that deploys all its parts and then doesn't care about drawing any more cards, since you can just choose not to lose the game via decking!
edit 2: am also open to the idea that this doesn't have to be highlander-style; wonder what you could do with the five basics, the commander and then six of the same card??
edit 3 lol: being able to ignore whatever effect you like probably shouldn't extend to cards exiling themselves, eg, anything with flashback or unearth. but if one card exiles another as part of an effect you can skip that part