In Tempest, it was turn one (Mogg Fanatics, shadow creatures, and flyers), Invasion turn two (2/2 bears for every possible color combination plus several one- and two-mana apprentices and utility creatures), and Mirage turn three
PLA should not be exposed to high heat, such as a hot car, for prolonged periods
Consider its card type, any effects that modify when you could cast it (such as flash) and any other effects that stop you from casting it (such as from Meddling Mage's ability) to determine if and when you can do this
You don't get another wizard when you re-cast the spell, but thats an incredible deal, especially when you consider how much value black decks squeeze from a stray creature token
While I think it is technically optimal since it's basically a free roll, we didn't play against counterspell decks at all
No, you cant use it as your commander