If a spell has multiple instances of storm, each triggers separately.
November 11, 2016 · Commander 2016
If a spell has multiple instances of affinity, each of them applies.
February 1, 2014 · Born of the Gods
The affinity ability reduces only the amount of generic mana a spell’s controller has to pay; it doesn’t reduce how much colored mana that player has to pay.
July 13, 2013 · Magic 2014
The affinity ability reduces only the amount of generic mana a spell's controller has to pay; it doesn't reduce how much colored mana that player has to pay.
September 30, 2011 · Innistrad
If the entwine cost was paid, follow the text of each of the modes in the order written on the card when the spell resolves.
June 17, 2011 · Commander 2011
If the entwine cost was paid, follow the text of each of the modes in the order written on
February 1, 2010 · Worldwake
If a creature has multiple instances of modular, each one works separately.