The Enemy-Colored Check Land Cycle Although not technically the more powerful cards from the list, the check land cycle are the most versatile
Being Rakdos-colored, this little Dragon can dive into the graveyard to cast Dragons, making any Dragon deck resistant to board wipe effects and non-exile spot removal, at the cost of the revived Dragon being unable to return a second time this way
Mana Crypt is a two mana boost on the spot, a fine addition to any combination deck, but its drawback is very real
This mana generators value depends on whether or not you have enough legendaries to maximize its mana income
Both are recyclable and reduce plastic waste
"Vivi Ornitier is warping the Standard format and likely needs to go." On the other hand, Agathas Soul Cauldron might be safe for now, so other iterations of the Izzet Cauldron deck will still be an option