(You are way behind if, at any point during this turn, an opponent had 10 or more life than you, controlled at least three more creatures than you, or had at least three more cards in hand than you.) To determine if you are way behind, check the game state as it was at any point during the current turn, regardless of whether Knight of Lost Causes was on the battlefield at that time
Yargle and Multani captures a cool exchange in which Multani sets aside the past in recognizing the gravity of the Phyrexian attack during the events of March of the Machine and teams up with the frog spirit, who I imagine sounds like an enormous wet wookiee
Most Wizards of the Coast first-edition cards have a circular stamp on the left-hand side that says "Edition 1." Shadowless and Unlimited cards don't have a stamp, but you can recognize them by copyright date
Its worse in that its harder to deal three damage to your opponent with it, but even that can happen by targeting your own large, unblocked creature