Raiyuu, Storm's Edge

The extra combat step has always been a build-around trigger stapled to something fragile: an enchantment, a sorcery, a body that has to survive to attack. Here it lives on a 3/3 with first strike, and the condition that unlocks it is the same condition Samurai already want to meet. A single attacker, alone, gets untapped and (in the first combat phase) hands you a second combat. That untap is the quiet engine: because the creature is no longer tapped, it swings again in the bonus phase, and a lord effect or an anthem turns that doubled attack into a real clock. The design threads a genuine needle. Go-wide decks get nothing from it, since the trigger demands a lone attacker; the reward is aimed squarely at the sword-and-a-single-blade fantasy the Samurai type has always chased and rarely paid off. First strike matters more than it looks, too: a lone attacker is exactly the creature most exposed to a blocker, and striking first keeps the engine intact through the crackback it invites. The untap-and-repeat structure echoes older extra-combat payoffs like Aggravated Assault, but those cost mana every turn and care about your whole board. Restricting the payoff to one attacker is what lets it ride free on a body, and it makes the deckbuilding question sharp rather than open: how do you build a lone Samurai into a lethal one before the second swing?