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Affinity for Allies reduces only the generic mana in Allies at Last's cost

While it hasnt quite lived up to expectations, that doesnt mean it hasnt made its mark on competitive Magic

For decks that want bodies as well as ramp it is one of the best, unlike mana elves you can Clamp it off or tap it for Opposition without losing the ramp

By increasing their power, through aura, lords, or counters, you can make each spell incredibly costly

It does not get any additional bonus for having more oil counters on it

This ability doesnt just trigger when you goad a creature, it just has to be forced to attack and must damage a players life total directly.