Mantle of Leadership
The flash clause is the whole engine here, even though the buff itself reads like an aggro afterthought. To catch the very enters trigger that a new body provides, you cast this aura in response to your own creature spell sitting on the stack: it resolves first, sticks to the host, and then the creature underneath it enters and pumps the enchanted attacker on the same turn. More to the point, it turns every subsequent creature you land into a combat trick already in play: a blocker walks into a creature that grows two more before damage, a chump trade becomes a profitable one, an alpha strike compounds with each token that hits the board. The design takes the static anthem and reshapes it into a per-event trigger, which is what lets it scale with go-wide boards in a way a flat +1/+1 anthem never does. Token generators and creature-spam strategies are where the math runs away: every body that enters refreshes the buff, so a single enchanted attacker can swing for a number that ignores its printed power. The cost is the aura's fragility (one removal spell on the host strands the enchantment for nothing) and the until-end-of-turn ceiling on each pulse, which refuses to bank value across turns. This is an aura built for a board in constant motion, rewarding the player who keeps creatures flowing rather than the one who already has the bigger thing.
