The best approach would be seeing how those old untamaed or beta card prices got increased over time. While the lowest ever unamed cards now selling for 0.25-0.37$, the lowest chaos cards are only 0.03-0.04$ per BCX. Same applied for gold foil too. SL returns a fortune to the long term holders and I am very bulish on this.
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RE: King slayer monsters with Giant Killer ability - My top 3 picks