Below I will talk about most used and popular cards and the reason I think so is that they kept their value while other cards prices went down a lot since they're released. First card is Sea Monster. This card is used a lot at lower leagues and advantages of this card are high health and healing ability. Second card is Brownie. The biggest advantage of this card is that it's a 1 mana card. Pirate Archer is also my favorite monsters. He has blast ability and when you use this card with Selenia Sky he have 3 range attack which is too powerful for 2 mana card.
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