Cloistered Youth // Unholy Fiend
Transform's first lesson in cost-benefit, taught with a body small enough that the trade reads cleanly. The front face does only one thing beyond its 1/1 stats: on your upkeep, you may flip it. That optional trigger is the entire decision, because the upgrade costs nothing to pay for but cannot be undone. Once flipped, the Unholy Fiend hits noticeably harder and never reverts, so the only price is the life it bleeds from you each end step. That irreversibility carries the whole design tension: a permanent transform with no off-switch, so the upkeep choice is genuinely a choice rather than a formality. You take the bigger body and accept the drain, and the drain compounds turn after turn until the creature either closes the game or becomes a liability against any deck willing to race your own life total. As an introduction to double-faced cards, it is deliberately legible: no enabling condition, no token economy, no transform tied to combat or spells cast, just a manual upgrade tucked behind a single upkeep trigger that asks whether you are the beatdown. That clarity does the teaching. It shows new players that the flip side of a double-faced creature is not always a free improvement, that transform can be a trade rather than a windfall, and that a deck pressing for damage has to weigh its own clock against the opponent's before it pays in life.
