We can also play Mirror Gallery, Mirror Box, and/or Sakashima of a Thousand Faces to turn off the legendary rule for ourselves
At the beginning of your end step, if a creature or planeswalker an opponent controlled was dealt excess damage this turn, create a 4/4 red Dragon creature token with flying
Im not sure if any Blue decks are doing that at the moment, but if Wizards creature a Blue bomb with an enter the battlefield text you can bet this card will be in the card list
Creature - Soldier Cat Color tag templates(None) Lord Skitter, Sewer King Whenever another Rat you control enters, exile up to one target card from an opponent's graveyard
You can also use this card to pay for any effect that would make you discard it or sacrifice it, returning it back to your hand when you get the chance
I'd be on the lookout for any Curiosity-esque reprints in the future, which is probably what this deck needs to go over the top