This is because they are legal on a case-by-case basis , rather than a blanket allowance or ban
He enjoys having great duels with worthy opponents and will be disappointed when denied a proper fight, either because his opponent was weak or because Gilgamesh feels that he is not able to fight at his full power
Its a great fit for decks that naturally mill, that fill their graveyard, or that revolve around delirium
We might not want to get so fancy, instead just using Avacyn as a raw power card: Creatures (13) Planeswalkers (2) Lands (26) Spells (19) Here were not really maximizing Archangel Avacyn, but its still a great card, and this way we get to put it alongside a bunch of other great cards
Im sure Finneas, Ace Archer is happy to see the rabbit creature type here, but Claim Jumpers a fine 99 th -100 th card for any white deck looking to fill out a couple slots