This is one of the rare features that causes goosebumps as Im writing
Even without it, Bladecoil Serpent can deal a devastating blow to the opponent if black mana is primarily used, while hooking up the control user if blue is used

Guilds of Ravnica Niv Mizzet, Parun , Emmara, Soul of the Accord , Lazav, the Multifarious (decklist in the comments) , Tajic, Legions Edge , Etrata, the Silencer Commander 2018 Aminatou, the Fateshifter , Xantcha, Sleeper Agent , Lord Windgrace Core Set 2019 Sai, Master Thopterist , Goreclaw, Terror of Qal Sisma , Vaevictis Asmadi, the Dire , Chromium, the Mutable Battlebond Dominaria Teshar, Ancestors Apostle , Grand Warlord Radha , Arvad the Cursed, Muldrotha, the Grave Tide , Slimefoot, the Stowaway , Yargle, Glutton of Urborg , Squee, the Immortal , Firesong and Sunspeaker , Jodah, Archmage Eternal Masters 25 Rivals of Ixalan Azor, the Lawbringer , Etali, Primal Storm , Nezahal, Primal Tide , Zacama, Primal Calamity , Tetzimoc, Primal Death , Zetalpa, Primal Dawn , Ghalta, Primal Hunger Unstable Grusilda, Monster Masher , Dr

Once a die is rolled, Vrondiss inflicts a point of damage on himself, this triggers his main ability to put a 5/4 green-red Dragon Spirit token into play each time he is dealt damage with the addition of When this creature deals damage, sacrifice it. is put into play
These are often cards that look like they should belong in the bad category, but somehow an archetype aligns as a perfect home for this crazy strategy and you can capitalize on it without much sacrifice