I play a lot of Green decks, some of that is for the ramp, but just as big is making sure you hit every land drop and Environmental Scientist is very good on that front
Cards like artifacts that add any mana act as pseudo copies of Mox Ruby (or any of the old Moxen, really) and big creatures can now get played on turn 1
Scraggy takes 20 additional damage from Grass-type attacks
Like most Pokmon cards, the value of Pidgeotto 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 (Call of Legends)
Rarity: Uncommon BEAMS Mewtwo EX Promo Jumbo Card (2013) I'm not sure what to say about this except that it's a strange recolor of the jumbo Mewtwo EX from the Mewtwo Collection Box, and that it's ridiculously expensive because it was a BEAMS promotional item
Then you can spend 4 mana to send a creature back to its owner's hand, and that can mean you if you want to bounce something and get another ETB bonus