Social Climber
The Alliance keyword exists to reward a wide board without asking you to declare that intent up front, and this druid uses it about as gently as the mechanic allows. The lifegain fires whenever another creature enters under your control, from the very second body onward, which makes the trigger easy to turn on but modest in what it pays: one life per arrival, no scaling, no ceiling. A 3/2 for in green wants to attack, but this one is built to stand behind the swarm rather than lead it, letting the incidental accrual pile up while a token engine or a run of cheap creatures does the real work. The design logic is deliberately low-stakes: a fragile body, an ability that keys off a width you were already building toward, and a life total that inches upward as a byproduct of doing what the deck wanted anyway. Tying the trigger to creatures entering the battlefield, rather than to spells cast, is the quiet check on the freeroll: flicker effects and tokens both feed it, but there is no lifegain on a whiff, and nothing here bails you out when the board is empty. The cushion is real against early aggression, giving a creature-heavy build the padding to soak the first few hits while it develops toward a swing that ends the game on damage. It is support-cast lifegain, a benefit of playing wide rather than a reason to.
