The cards already in your collection cannot be added to your decks, but rather you use what you get during the event, and with a couple exceptions, you add them to your collection afterward
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How do you maximize your token output
Bolas's Citadel works very well with Aetherflux Reservoir, since even though you pay with life when you play a spell off the top of your library, youre still casting said spell and getting the Reservoir's lifegain
Territory Forge isnt a ramp card, never mind one that should be this high on the list
Plus, youre always free to choose an opponent with no graveyard, which will be pretty feasible in the early turns (when Skullwinder can give you back a ramp spell or a used fetchland)