Quote from Manite »Bartizan Bats fulfills a number of useful roles as is. For starters, its 1 toughness makes it easy to kill, which in turn helps it fill the graveyard and feed Undergrowth. That 3 power hits really hard in the early game, especially on a flyer that can either swing and quite possibly trade or as a blocker that makes attacking foreboding for the opponent.
Quote from Watchwolf »As for the Vine, nobody likes designing useless cards, but they're important in that they allow the more exciting cards to stand out. It's a tool for draft to push players toward picking some cards over others, which can speed up drafting rounds. I've played enough power cubes where every card is first-pickable to know that that leads to very long, painful, drawn-out decision-making. Bad cards make the choice a bit easier and double as determining the baseline power level of that draft environment.