There's a good number of swaps in this version of the deck, but we've only added common and uncommon cards, so it shouldn't be too difficult to get your hands on them
A Languish that gives the monarch is maybe slightly overcosted at six and could have happily been five but I think its absolutely fine at six mana, anyway
But Izzet does like artifacts, so the usual trio of Oblivion Stone, Nevinyrral's Disk, and Perilous Vault are all fine board-clearing options
Simple shipping pricing : Flat domestic and international numbers are easy to plan around
Number Five A creature with a playable power/toughness that makes an innocuous looking piece of carboard when it Enters has been a staple of standard for the last few years
You can also trash a card from your hand to shut down your opponents On Play effects until the end of their next turn, preventing them from using the triggers they want and giving you an advantage