pokemon legendary treasures booster box TCG: JAPANESE: White Flare Illustration Rares Opening a Legendary Treasures Booster

Options for these are plentiful, and easy to find at any LGS that sells cards

That feels about average for a mildly-upgraded EDH deck these days, but you should take into consideration many of the essential knight cards in this deck are sold together in the Cavalry Charge precon deck from March of the Machines

Kaya the Inexorable Emblem Emblem At the beginning of your upkeep, you may cast a legendary spell from your hand, from your graveyard, or from among cards you own in exile without paying its mana cost

Considering it requires enabling first, and it doesn't work with monsters in the GY, I guess that field's fine