Cait, Cage Brawler

Indestructible only during your turn is a deliberately half-open shield: Cait resists destruction while she is doing damage and exposed the moment the turn passes, which pressures the pilot to keep swinging rather than sit on a growing threat. The counters stay, but the protection does not, so a defended board leaves you a larger creature that is suddenly killable rather than a fragile one. The combat trigger feeds that same forward motion. Both players rummage, drawing and discarding one apiece, but the growth clause pays out only when the card you pitched out-costs (or ties) your opponent's discard. That inverts the usual madness or delirium logic: instead of rewarding a specific card type in the yard, it rewards you for feeding the graveyard something heavier than their chaff, so a hand clogged with expensive threats becomes fuel rather than dead weight. The two clauses lock together cleanly. The swing that grows her is the same swing that shields her while she does it, and both reward the pilot who refuses to stop attacking. What you are steering is a destruction-proof body on your turn and an exposed one on theirs, a timing asymmetry that punishes passivity and turns hand quality, not just board state, into the resource that decides how big she gets.