They are only removed if the card instructs to do so, or through an action card such as Break
I was able to sell them locally to a player for $30 per copy and plan to buy them back in October during Battle for Zendikar hype
Unlike triggers, you cant apply multiple replacement effects to the same event instead, the player being affected (or owner of the object being affected) chooses from among all possible replacements
Talrand, Sky Summoner Counterspells are great, but they do not win the game by themselves
Iron Thorns first attack only costs 2 energy , and because one of those energy is colorless, it could immediately be energy accelerated with Crispin
That second, free copy of the spell is where the Rebound mechanic really shines