Owlbear Cub

The joke lands before the mechanic does: a cub attacks, and Mom follows. What keeps Mama's Coming from being a cute name is how tightly the trigger is fenced. It only fires when you attack a player who controls eight or more lands, so the payoff is gated behind an opponent who has committed to a long game, which is precisely the game a green midrange deck wants to be playing. The dig runs deep (the top eight cards) but the reward stays narrow (one creature, and only a creature), and whatever it pulls arrives tapped and attacking that same player: not blocking, not developing your board on a calm turn. This is not a value engine you turn on at will. The ability triggers on the declare-attackers step and goes on the stack, so both players get priority before it resolves, but the trigger is independent of the cub itself: killing the cub in response does nothing to stop it, since the ability is already on the stack. The eight-land clause reads as flavor (a big table, a big threat, Mama in the woods) while doing real balancing work, tying the free creature to a specific board state rather than a turn count. Green has a long history of cheating creatures into play; here the cheat is bolted to the attack trigger and the extra body enters swinging, converting one attacking cub into a two-creature assault against exactly the resource-heavy opponent green struggles to race.