
Job selectJob selectWhen this Equipment enters, create a 1/1 colorless Hero creature token, then attach this to it.
Equipped creature gets +1/+1, is a Ninja in addition to its other types, and has "Whenever this creature deals combat damage to a player, draw a card, then discard a card. That player loses life equal to the discarded card's mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing has mana value 4. X counts as 0 except on the stack.."
Mutsunokami — EquipEquipPay the cost to attach this Equipment to a creature you control. Equip only as a sorcery.
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Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.