
Whenever Tetsuo attacks, if it's equipped, choose one —
• Tetsuo deals damage equal to the greatest 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. among Equipment attached to it to any target.
• You may cast an instant or sorcery spell from your hand with 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. less than or equal to the greatest 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. among Equipment attached to Tetsuo without paying its mana cost.
Hover an underlined rule to see what it means.
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.