Your search for "Magic Commander's Arsenal - Box Set" revealed the following:
EX Resource - EXR-001 - Common from Deck Build Box Freedom Ascension, available at 401 Games Canada. Rarity: Common Finish: Normal
NAMI (054) - ONE PIECE JAPANESE 3RD ANNIVERSARY SET - MINT 9 is available at 401 Games Canada! You can find lots of other One Piece Singles products as well as more great items from Collector's Corner!
Mikazuki Augus (SC01 Reprint) - ST05-010 - Common from Deck Build Box Freedom Ascension, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Michinori Chloe