Lin Sivvi, Defiant Hero

The engine that turned Rebels from a draft-chaff creature type into a tutor chain. Tap her, pay X, and any Rebel of mana value X or less goes straight onto the battlefield: each fetch ratchets up to the next, so a single activation snowballs into a toolbox of hatebears, removal-on-a-stick Rebels, and lockdown pieces summoned in sequence rather than drawn into. The graveyard ability is the quiet half that made her too good for her own format: bottoming a dead Rebel recycles the toolbox so the chain never runs dry, which is exactly why she was banned in her contemporary Standard. What makes the design land is the tax structure: the search is gated behind the tap and a per-activation X payment, so the chain unfolds across turns rather than in a single explosive turn, and the 1/3 body invites removal as the natural answer. The activation timing is unrestricted, though, which is the sharp edge the rate would otherwise hide: nothing stops her from fetching a relevant Rebel on the opponent's turn, holding mana open and reacting to what they commit rather than telegraphing the search on your own main phase. Tutoring a permanent directly into play, bypassing its mana cost entirely, is the kind of effect Wizards now reserves for narrow, expensive cards; here it was bolted to a three-drop legend with no cap on how many times you could pull the lever. The Rebel tribe she anchored never returned in force, leaving her the high-water mark of an archetype built almost entirely to feed one creature's search engine.