Scythe Tiger
A 3/2 for a single green mana is a curve nobody's body should be allowed to occupy, and shroud only sweetens the deal: an aggressive beater that no targeted removal spell can answer, no Pacifism can pin down, no targeted bounce can reset. The land sacrifice is the entire bill. You pay it on entry or the tiger never sticks, so to land an untouchable clock a turn ahead of schedule you throw your own development under the bus. That trade reads worst on the play and worst in a deck that needs every land drop, which is precisely the deck that wants a one-mana 3/2 least. The interesting tension is that shroud cuts both ways: the same protection that walls off your opponent's interaction also walls off your own enchantments, equipment, and pump spells. You cannot suit it up, so the tiger lives or dies on its naked stats, and those stats were built to be enough on their own. Threats that demand a permanent resource up front in exchange for untargetability are a small, self-policing family; the land you sacrifice is the timer that keeps the rate from being a free lunch, and the harder you press the aggression the more your own mana base frays underneath you.
