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Rona Combo- I suspect Archfiend is better in general just because it kills faster and is substantially better if you have access to Metamorphic Alteration (they Lukka into Atraxa, then you combo them on your turn)

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Red Shanks (OP16): Shrinks opposing character power to zero before sweeping them off the board

You can see your total collection value change month over month, identify which cards are dragging performance down, and make informed decisions about rebalancing (selling deprecating cards and buying appreciating ones)