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
Untapping and goading the attacking creatures won't remove them from combat, even if they're attacking you
But what's most impressive is that, once you've cast Hildibrand from your command zone, you won't likely need to cast it from the command zone again, sidestepping the whole pesky commander tax that mere mortal commanders have to contend with
(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
It is for sale at a price of $ 3.50