You dont even need to be running blue to play this
Summary Dismissal Perhaps my favourite counterspell right now, Summary Dismissal is a catch-all answer
Progenitus Progenituss second ability isnt really that relevant to Commander since you can just return it to the command zone, but a 10/10 for 10 with protection from everything is nothing to sneeze at
This complicated baton-toss maneuver isnt terribly useful within a game of Magic , but in equipment-heavy voltron decks (where you focus on beefing up one or a few of your creatures), Cloud is totally viable
Transform Invasion of Fiora // Marchesa, Resolute Monarch, and you can immediately transform another battle so long as it is not another Invasion of Fiora
Reanimator decks are looking to get a powerful creature into the graveyard quickly through discard or Entomb effects, then cast a spell to return it to the battlefield at a steep mana discount