(If they're equipped to the same creature, the abilities of the equipped creature will also trigger three times.) An ability of the equipped creature that triggers when a card is put into a graveyard "from anywhere" triggers twice only if (a) a creature card was put into a graveyard from the battlefield and (b) The Masamune is still on the battlefield and attached to the creature with the relevant ability
Subsequently, throughout May, Wizards is running a new promotion to get players into their stores
The pre-solution ability of Case of the Shifting Visage even helps Solve your case while offering card selection
Notice how, among 2-color decks, Azorius and Boros are the most popular (around 7,200 games each), and Izzet is third with about 6,200
That latter one is nasty to make mana from a mana rock like Gilded Lotus or Thran Dynamo
You cant combo that well, but its a cheaper creature and it lets you play three colors, which is huge for EDH