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An activated mana ability is one that could produce mana as it resolves, doesn't require a target, and isn't a loyalty ability

You can only use this effect of "CXyz Barian Hope" once per turn

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Nine-Lives Familiar is nigh unkillable if you pair it with the right cards, like a certain counter-doubling enchantment thats also in this set

If choosing to use their Pendulum monsters, Deskbots 005 and 006 are the best options as they provide opportunity to target an opponent's cards and allow for a more consistent OTK (One Turn Kill), which is the name of the game when playing Deskbots.

theyre pretty versatile since you can blow your opponent out by trading up in combat, or you can stop random removal spells and board wipes from taking out your best creature