You could Stand to keep your Commander from dying to lethal damage or to retain a vital tool after a damage-based mass removal spell like Earthquake
"Were people really so incensed that Phyrexian Negator was reprinted?"
Archive Trap Archive trap may not be all that great at first glance since it requires your opponent to search for a card to be cast for free but that effect triggers on search lands as well
Storm-Kiln Artist A key card in a spellslinger and/or Treasures deck, Storm-Kiln Artist is a must-include in a number of decks, including just about everything in Izzet and just about every deck that runs Krark, the Thumbless as one of its commanders
Illustrated by Brian Despain Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
Many Commander players and cube designers also use double-sided cards for token systems, upgraded creatures, alternate commanders, and custom mechanics where gameplay changes dynamically during matches