Pirates are all about attacking, with cards like Dire Fleet Neckbreaker giving our creatures a huge boost of power when they go on the offense. This means we have a lot of cheap Pirates in the deck, but Ruin Raider helps to make sure that we don't run out of action by drawing us an extra card each turn (as long as we keep attacking). Thanks to being in red and black, we also get to play one of the best two-mana removal spells in Magic in Terminate and one of the most powerful discard spells in the format, with Blightning not only making our opponent discard two cards but also giving us three points of damage to close out the game, if we can get our opponent's life total low enough.