Valkyrie Harbinger

Angels have always been priced as top-end payoffs, but this one turns the payoff into a payoff engine: the lifelink is not incidental gain, it is the fuel line that trips its own end-step check. A 4/5 flyer with lifelink clears the four-life bar in a single connection, and from there every turn you keep attacking manufactures another 4/4 flyer with vigilance. The tokens themselves do not gain life (they carry flying and vigilance, not lifelink), so the loop is not self-sustaining through them alone; the Harbinger stays the meter that has to keep swinging or be joined by another source of gain. That is what makes the design worth studying. Older lifegain-matters cards tended to reward the gaining once, at the moment it happened; this one reads the whole turn's total at the end step, so any life from any source (a second lifelinker, an incidental gain spell, a life-drain trigger) can satisfy the condition without the Angel personally dealing the damage. It is a token generator that happens to wear an Angel body, rather than an Angel that happens to gain life. The four-life threshold is the restraint: high enough that a stray point of damage will not clear it, low enough that one lifelink swing or a pair of small gains does. Where lifelink usually reads as a purely defensive keyword, this converts it into board development, the axis white most reliably lacks.