A-Satoru Umezawa

Ninjutsu was always a return-fire mechanic: swing with an unblocked attacker, then swap it for a ninja from hand, bouncing the attacker back to owner's hand as the price. The clause that kept it fair was that only actual Ninja cards carried the keyword. This creature rewrites that clause wholesale. With it in play, every creature card in your hand gains ninjutsu at a fixed rate, which turns a tribal payoff into a general-purpose cheat-into-play engine: a nine-mana finisher enters for at instant speed during combat, sidestepping summoning sickness and dodging sorcery-speed removal because it arrives after blocks are declared. The dig on each ninjutsu trigger (look at the top three, keep one, bottom the rest) is what feeds the machine, refilling faster than a single loop can spend. The discipline holding it together is the once-per-turn clamp on that selection: you can ninjutsu as many times as your board allows, but the card advantage smooths out just once. It stacks the two halves of the mechanic that had always lived on separate cards, the surprise substitution and the reload, and hands them to any body a deck can jam into an opening grip. What ninjutsu quietly demanded (build around the creature type) it answers by deleting the requirement, and the resulting engine is less about ninjas than about the widest, most punishing thing you can afford to drop for three mana on the swing.