text: In the rare case where Don & Raph's last ability resolves more than once in the same turn (probably because there were multiple combat phases), a single noncreature spell might have multiple instances of affinity for artifacts. Those abilities are cumulative. For example, if you attacked twice with Don & Raph in the same turn without casting any noncreature spells in between those attacks, the next noncreature spell you cast that turn would cost {2} less to cast for each artifact you controlled.