Ink-Eyes, Servant of Oni

Ninjutsu was the mechanic that let a creature sidestep the entire summoning-sickness tax, swapping an unblocked attacker back to hand for something nastier mid-combat, and this is the card the keyword was built to flex. The trade is the point: a low-impact body gets through, returns to hand, and a 5/4 drops in already tapped and attacking, skipping the turn it would otherwise sit doing nothing. What it does on connection is the real prize. Combat damage to a player drags a creature out of their graveyard and onto your side of the table permanently, no temporary-control caveat, no sacrifice clause, just open reanimation that scales with whatever the opponent has lost so far. The regeneration ability is the insurance that keeps the loop alive: for it shrugs off the kind of spot removal that would normally answer a six-drop threat, so once it is connecting it tends to keep connecting. That combination, an evasive entry, a graveyard-theft trigger, and a body that refuses to die to a destruction-based removal spell, is why a black rare from the era of small-set Kamigawa designs has stayed in the conversation far longer than its rate alone would justify. It reads like a finisher and a value engine stapled together, and the ninjutsu cost is the thing that lets it arrive a turn ahead of where a hard-cast six-drop ever could.