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I sold half of mine and holding the other half. Probably should have held them all. It was almost a year that I thought I made a mistake as they had no advantage to beta packs, then it turned around.

Dec makes them very valuable.

How so? When I sold my cards, most sold on the market for more than DEC but some did have a higher DEC value.

I mean for alpha packs. The chance of getting more dec is probably a reason why people want alpha cards, and thus alpha packs.

Each Alpha card used in battle gives +10% DEC bonus.