These examples highlight Wizards willingness to port over Un-set creature types to the main game where appropriate
Starn has a static ability that reads "Whenever another source you control deals exactly 1 damage to a permanent or player, Ghyrson Starn, Kelermorph deals 2 damage to that permanent or player"
Drawing 2 cards is always handy, but adding 2 Grass to a benched Vespiquen is the real use of it
Nope, only chewing, licking, sucking and swallowing
Like most Pokmon cards, the value of Gastly depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (HSTriumphant)
Chato played Magic competitively back in the day and was a Top 10 Vintage player back when the format was still called Type 1