Spring-Leaf Avenger

Most ninjutsu creatures take the mechanic as a tempo trick: swap a chump one-drop for something oversized and connect. This one repurposes the connection into a recursion engine. The combat-damage trigger returns any permanent card from your graveyard, not just a creature, which is a wider net than the phrasing lets on: an enchantment, an artifact, a planeswalker, a land, whatever died and mattered comes back to your hand. What makes that trigger reliable is the delivery. Ninjutsu returns your unblocked attacker and drops this onto the battlefield already tapped and attacking, so it slides into a connection you have already earned rather than gambling on surviving to the next combat. The timing dodges sorcery-speed removal too: it arrives after blocks are declared, past the point where an opponent can profitably trade with it. The body carries the plan forward, since a 6/5 is not something the defending player wants to chump indefinitely, and a repeatable graveyard-to-hand trigger on that frame turns each unimpeded swing into compounding card advantage. The design logic is a Ninja that stops caring about the archetype's swap-and-punch tempo and starts treating combat damage as an engine, with the ninjutsu cost as the price of guaranteeing the hit lands.