I built two versions of Isshin, Two Heavens as One last time, one targeted at playing well within my own group and one quite a bit spicier
Tibalts Trickery Tibalts Trickery is one of the fastest cards banned in Modern history
Using Celesteela, swap Buzzwole EX with a UB that has 1 Energy retreat cost (Kartana/Pheromosa), give the turns Energy to Kartana/Pheromosa, retreat, and bring back Buzzwole EX with a rejuvenated Big Beat
Mana Cost / Mana Value Some rules and effects care about a cards mana value as a measure of how expensive the card is
Neriv, Heart of the Storm is the most practical version of the two and focuses on boosting the damage of creatures with haste
Thankfully, Agatha's Soul Cauldron isn't posting Skullclamp numbers, but it's still omnipresent in the format