Maybe there's another Blazing Shoalbased deck or combo that could be scary, although it seems like it would have the same problem as Shoal Infect (needing to play a bunch of expensive, uncastable cards to make Blazing Shoal work)
Ok Booster Box (YuGiOh Metal Raiders) Details Full Price Guide: Booster Box (YuGiOh Metal Raiders) All prices are the current market price
The crazy thing about this ability is that it technically isnt inflicting damage to your opponent, its simply halving their LP this means they cant activate any cards like Gorz the Emissary of Darkness back at you, or any sort of effects that regain burn damage
Bumbleflower Perrie, the Pulverizer Phelddagrif Rafiq of the Many Ragnar Rigo, Streetwise Mentor Roon of the Hidden Realm Rubinia Soulsinger Shanna, Purifying Blade Shaun & Rebecca, Agents Sophia, Dogged Detective Storvald, Frost Giant Jarl Surris, Silk-Tech Vanguard Tidus, Yuna's Guardian Tocasia, Dig Site Mentor Treva, the Renewer Tuvasa the Sunlit Yuna, Grand Summoner