They can just be two or more cards that are more powerful when played together
Hard wearing, even in the most intense duels
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Brigid's Command Brigid's Command includes a fight mode and the most sensible one to help your fight is the +3/+3 option
It's less commonly used as an activated ability, like on Doorkeeper which lets you pay two generic and a blue to mill someone for as many cards as creatures with defender you control
However, the potential afforded by this card is so stupidly strong that all Water decks need to have it at their disposal: if you get lucky, your Water types at looking at three, four, five, or even six Energy