While Foundations merely upgraded Shock to Burst Lightning, the deck has also cemented itself as a top-tier strategy in the current Standard metagame
No matter how you play, you'll find something uniquely you in a Set Booster
Zimone, Mystery Unraveler (Commander) by Mila Pesic
With these two pieces in play, the Izzet Cauldron strategy as named after the colloquial name for MTG s Blue/Red color-combination, itself derived from the games in-universe Izzet League mages guild and, of course, Agathas Soul Cauldron involves using Agathas Soul Cauldron to apply Vivi Ortinier s ability (and yes, this effect can stack regardless of the number of Vivi Ornitier copies exiled) to ones creatures and using a barrage of cheap Instants like Shock or Burst Lightning to simultaneously pump up their power and provide more mana for additional spells

Tameshi Belcher (8.6% of the Winner's Metagame) 4 Goblin Charbelcher 4 Lotus Bloom 4 Fallaji Archaeologist 4 Hydroelectric Specimen 4 Tameshi, Reality Architect 4 Thundertrap Trainer 4 Beyeen Veil 4 Disrupting Shoal 4 Flare of Denial 4 Jwari Disruption 4 Sink into Stupor 4 Whir of Invention 4 Sea Gate Restoration 4 Suppression Ray 3 Spell Snare 1 Stern Scolding 3 Consign to Memory 3 Harbinger of the Seas 1 Force of Negation 1 Mountain 1 Into the Flood Maw 1 Portable Hole 1 Commandeer 1 Pact of Negation 1 Stern Scolding 1 Flusterstorm 1 Tezzeret the Seeker Tameshi Belcher has emerged as Modern's premier combo deck in the wake of the Underworld Breach ban
What the ciphered card offers is the spell cast trigger