Glorious Enforcer

Lifelink and double strike form a loop that feeds itself: the lifelink swing this turn pushes your total above an opponent's, which arms the double strike that swings even harder next combat, which gains twice the life. The trigger keys off having more life than any single opponent (not all of them, not a fixed threshold), so this angel comes online the moment your total edges ahead, and once ahead the body does the work of staying there. That conditional is the whole design tension of a large lifelink flier: the standard failure mode is that a 5/5 lifelink body is fine but never threatening, a wall with wings that stalls the board without closing it. Wiring double strike to a life lead solves that by making the lifegain the fuel rather than the payoff. Ten damage in the air at seven mana is a fast clock, and the flight means the counter-race an opponent needs to run has to happen through the same evasive body that keeps widening the gap. The catch is symmetric to its strength: fall behind on life and the double strike simply never triggers, leaving you with the vanilla-ish flier the design is trying to escape. It rewards being ahead and punishes being behind, which is a sharper axis than most top-end angels commit to.