QuoteTrading and drafting are much cheaper ways to onboard people than "buy the entire card pool
Trading and drafting are vastly inferior ways to onboard people. This is not an opinion, this is a mathematical and economic fact. They're only necessary, or at all beneficial, in an environment where variable rarity and blind distribution deprive customers of fair value for their purchases. That simply doesn't apply to LCGs
Collections built by trading and drafting are necessarily incomplete and unpredictable, and incidentally unfair to those new players you're so concerned with: veteran players will have great advantages in understanding card evaluation and valuation which they'll bring to the bargaining table.
And it's all unnecessary because the cards are available at retail, and your model guarantees reduced retail sales! It's bad for the game, it's bad for players, it's bad for deckbuilding, it's bad for design.
Your idea is objectively terrible.