Crossroads Watcher

A go-wide payoff bolted onto a body that already wants to attack, and the key detail is what it reads off: creatures entering, not spells cast. Every body that lands after this one on a given turn shoves another point of power through, and because the boosts stack, a flooded board turns a modest 3/3 into a genuine trample threat rather than a wall of one-for-one trades. Keying off entering rather than casting quietly widens the pool of enablers: tokens, flicker, and recursion feed the effect exactly as well as a curve of mana dorks, and the pump does not care whether the incoming creature could attack itself. The restraint is that the +1/+0 lasts only through the current turn; nothing snowballs across turns, the size resets, and the card wants its swarm developed on the turn it swings rather than banked for later. That timing pushes it toward decks that empty their hand and commit, where a post-combat-irrelevant pile of small creatures becomes lethal because of what trample does with the overflow. It reaches for the aggressive Kithkin lord effect without being a lord: it buffs only itself, only in power, and only for the swing, trading the durability of a static anthem for a ceiling that scales with how hard you are willing to overextend into the crackback.