Firebending 1 (Whenever this creature attacks, add . This mana lasts until end of combat.)
Whenever you cast a noncreature spell, Zuko gains first strike until end of turn.
Whenever Zuko deals combat damage to a player, put a +1/+1 counter on him.
Zuko is a mono-attacker that snowballs through combat: connect once, grow a +1/+1 counter, and use Firebending mana plus a steady stream of cheap noncreature spells (granting first strike) to push damage through. You curve out a low aggressive board, suit Zuko up, and close fast with commander damage while burn and spellslinger payoffs punish any blockers.
Self-growing commander that scales without extra investment once it connects
Firebending ramp lets you double-spell in combat for protection and tempo
First strike trigger makes Zuko a safe attacker and a great Voltron carrier
Aggressive 3-mana body in fast, low-curve Rakdos shells
Relies on connecting in combat—chump blockers and fog effects stall the plan
Commander-damage focus is fragile to single-target removal and edicts
No built-in evasion; needs equipment/auras or trample to get through
Vulnerable to going wide against multiple blockers and life-gain decks