Unless youre attacking with quite a few creaturesin which case youre probably killing someone anywayyour creatures will need trample to really get value out of Storm the Citadel
Your odds for getting 100% of the market value increase if you sell your chase cards to a private buyer
(A copy of a permanent spell becomes a token.) Whenever an opponent casts an artifact, instant, or sorcery spell, counter that spell
If you do not want the piece you can re-consign it to the next appropriate auction for a fee of 30%
In a pinch, it also works as another (too expensive) Phyresis for your own creatures
By sacrificing your own board with it on the stack, and by pre-emptying your opponents yards with anything from a Soul-Guide Lantern to an Author of Shadows, you can simultaneously wipe the board, get a load of EtBs, and slingshot into the lead