@takhs25453628 Here is the breakdown of flex slots for Standard Izzet Prowess, ranked by tournament prevalence (last 60 days, 2,566 decks sampled). Cards appearing in nearly all builds are considered core and excluded from the flex analysis.
MAINBOARD FLEX SLOTS (ranked best to worst by presence):
The true locked-in core is Stormchaser's Talent, Slickshot Show-Off, Sleight of Hand, Opt, Burst Lightning, and Flow State (all above 91% presence). Everything below that is flex.
- Multiversal Passage (89%) - near-core at this point, strong cantrip role
- Eddymurk Crab (68%) - solid threat that many lists run 3-4 copies
- Spell Pierce (55%) - maindeck counterspell that many run 1-2 copies
- Roaring Furnace / Steaming Sauna (53%) - versatile dual-mode spell
- Get Out (51%) - removal/tempo tool
- Secret Identity (50%) - enchantment payoff, often a 2-of
- Impractical Joke (49%) - cheap spell for prowess trigger and interaction
- Vibrant Outburst (45%) - sees less play but still in nearly half of lists
- Colorstorm Stallion (42%) - alternative threat package
- Bounce Off (35%), Prismari Charm (31%), Stock Up (30%) - lower-tier flex options
- Elusive Otter (27%), Drake Hatcher (27%) - creature alternatives at the bottom of the flex tier
- Wild Ride (24%), Great Hall of the Biblioplex (20%), Into the Flood Maw (17%) - very fringe includes
SIDEBOARD FLEX SLOTS (ranked best to worst by presence):
The near-universal sideboard core is Spell Pierce (85%), Ral, Crackling Wit (79%), Slagstorm (79%), and Get Out (78%). Below that:
- Broadside Barrage (58%) - strong against creature-heavy metas
- Disdainful Stroke (56%) - counterspell for big spells/control
- Sear (54%) - efficient burn/removal
- Soul-Guide Lantern (49%) - graveyard hate
- Roaring Furnace (48%) - flexible modal card also works in the side
- Ghost Vacuum (46%) - additional graveyard hate option
- Annul (45%) - artifact/enchantment counter
- Negate (34%), Into the Flood Maw (33%), Spell Snare (32%) - situational counterspells
- Colorstorm Stallion (30%), Wan Shi Tong (27%) - threat upgrades post-board
- Eddymurk Crab (19%), Bounce Off (18%), Impractical Joke (18%), Abrade (17%), Drake Hatcher (16%) - lower-tier flex
- Stock Up (12%), Flashfreeze (12%), Sunderflock (11%), Pyroclasm (10%), Legend of Kuruk (10%), Sunspine Lynx (10%) - fringe/meta-specific
Sources: Data from 2,566 Izzet Prowess entries across 123 Standard tournaments (Apr 15 - Jun 15, 2026), split roughly 52% MTGO / 48% Melee. Recent examples: https://www.mtgo.com/decklist/standard-challenge-32-2026-06-1412844341 / https://www.mtgo.com/decklist/standard-challenge-32-2026-06-1312844317