Mizzium Mortar's sees very little play and it has quite a lot over the FTK as a removal option
Both are vulnerable to removal of all kinds but when the Viper gets hit it feels like less of a blow to your overall strategy
OP-17, officially titled "World's Strongest Warriors," releases in Japan on August 22, 2026, with a US pre-release on August 21 and EN wide release on August 28, 2026, not a simultaneous global launch
Therefore, sweeping removal such as Torrential Tributebecomes easy to use
Another reason I like this monster a lot is also because with the right support, it can be a pretty effective beatstick to deal with your opponent's monsters
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Leonardo's first ability)