Cold Blooded

Commander creatures you own have deathtouch and lifelink and "Whenever this creature is paired with another creature, if at any point it becomes paired with another creature that is not the creature it was previously paired with, you must exile two cards from your hand. If you don't, you lose the game." and "Whenever this creature is paired with another creature, if either were to enter a graveyard, the other would also be put into your graveyard. you lose 2 life."

Your maximum hand size is one less fo