New Redemption Grab Bag now includes an assortment of 500 cards from five (5) different expansion sets. Available at Cactus website.
You should agree on that beforehand. There is no rule that says "you don't have to tear this in casual play." His opponenent was well within his rights to insist it be torn if the special ability is used. Keep in mind, you can just play it for the numbers (not use the special ability) and then you don't have to tear it.
You make up whatever rules you want in casual play.