Territorial Boar

The reward here points in an unusual direction: the buff triggers not off this creature attacking or connecting, but off any sizable creature you control arriving on the battlefield. That makes it a payoff wearing a two-drop body, priced to hit the board first and cash in later as the heavy hitters land. Because the trigger reads "a creature you control," it does not exclude the Boar itself: an effect that puts it into play as a large enough threat would fire the ability off its own entrance. The vigilance clause tells you what the design wants. A 2/2 that swells to 3/3 and can swing without tapping down is built to keep pressure on while the fatter threats it feeds off do the muscle work. Its floor is a modest body that has done nothing yet, and its ceiling depends entirely on how many four-power creatures a deck can chain out, a real constraint because nothing on the card manufactures that size on its own. It rewards a curve that climbs into genuine haymakers rather than a flat, small board, and it wants those threats to enter in clusters so the pump-and-vigilance can stack across a single turn. This is a beneficiary of a heavy-green, top-heavy plan, converting surplus creature entrances into incremental combat math: it is paid off by the big threats, never the thing that puts them on the table.