You should run this artifact creature when you have artifact synergies, especially with cards like Indomitable Archangel and Urza, Prince of Kroog that benefit from becoming artifacts themselves
Silver Myr and Ornithopter of Paradise are more traditional mana dorks, tapping themselves to add mana, and Urza, Lord High Artificer can tap artifacts for blue mana
But this is Commander, and shenanigans abound, so if youve done your due diligence and put in shock lands and mana rocks, you should be fine
Your decks
If a creature in combat has first strike or double strike, you can activate the ninjutsu ability during the first-strike combat damage step
You can find this card in almost any condition, with near-mint (NM) copies commanding $3.50, lightly played (LP) copies coming in at about two dollars, and moderately played (MP) versions available for as little as $1.97, which isn't much of a discount at all