With just two in each set, and with them being even rarer than Enchanted cards, these are likely to remain valuable for some time to come
The reason for that is due to the number on the card going above the official number of cards in the set
This cross-format superstar has excelled at every level, basically single-handedly justifying an ungodly number of splashes (both white into black and black into white)
Those are just characters, as Megabot, Baymaxs Healthcare Chip, and Heffalumps And Woozles all give you more options to play with, including banishing an opposing item from play, healing damage from your characters, or making it so a character cant quest during their next turn
(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
