(It counts as flipping a coin, not rolling a die.) Each time a spell or ability instructs you to flip a coin, you may apply Pokey's second ability as a replacement effect to roll a d20 instead

Ive gone through our choices grouped by mana cost, with notes about what each one provides: One Mana Galerider Sliver (flying), Striking Sliver (first strike), Metallic Sliver (vanilla colorless), Mindlash Sliver (sac, everyone discards), Plated Sliver (+0/+1), Screeching Sliver (tap, mill 1), Sidewinder Sliver (flanking), Virulent Sliver (poisonous 1) Two Mana Sentinel Sliver (vigilance), Manaweft Sliver (tap for mana), Predatory Sliver (+1/+1), Acidic Sliver (sac, Shock), Cautery Sliver (sac, 1 damage dealt or prevented), Clot Sliver (regenerate for mana), Crypt Sliver (tap to regenerate), Crystalline Sliver (shroud), Darkheart Sliver (sac, gain 3 life), Frenzy Sliver (frenzy 1), Gemhide Sliver (tap for mana), Ghostflame Sliver (all slivers become colorless), Heart Sliver (haste), Hibernation Sliver (pay 2 life, return to hand), Hunter Sliver (provoke), Mistform Sliver (1: gain another creature type), Muscle Sliver (+1/+1), Quick Sliver (flash), Quilled Sliver (tap, ping combatants), Sinew Sliver (+1/+1), Spined Sliver (+1/+1 for each blocker), Spinneret Sliver (reach), Talon Sliver (first strike), Two-Headed Sliver (Goblin War Drums), Victual Sliver (2, sac: gain 4 life), Winged Sliver (flying) Three Mana Steelform Sliver (+0/+1), Syphon Sliver (lifelink), Blur Sliver (haste), Sliver Construct (vanilla colorless), Armor Sliver (2: +0/+1), Barbed Sliver (2: +1/+0), Basal Sliver (sac, add BB), Blade Sliver (+1/+0), Firewake Sliver (1, sac, give Sliver +2/+2), Frenetic Sliver (Frenetic Efreet), Harmonic Sliver (Naturalize), Homing Sliver (slivercycling), Horned Sliver (trample), Mindwhip Sliver (2, sac: player discards at random), Mnemonic Sliver (2, sac: draw a card), Necrotic Sliver (3, sac: destroy permanent), Opaline Sliver (if targeted by a spell, draw a card), Poultice Sliver (2, tap: regenerate), Sedge Sliver (Sedge Troll), Shadow Sliver (shadow), Spectral Sliver (2: +1/+1) Four Mana Bonescythe Sliver (double strike), Bonesplitter Sliver (+2/+0), Dormant Sliver (defender, Glimpse of Nature), Essence Sliver (lifelink), Fungus Sliver (Fungusaur), Magma Sliver (tap, +X/+0, X=#of Slivers), Mesmeric Sliver (fateseal 1), Plague Sliver (Juzm Djinn drawback), Reflex Sliver (haste), Root Sliver (cant be countered), Shifting Sliver (cant be blocked by non-Slivers), Telekinetic Sliver (Opposition), Toxin Sliver (deathtouch), Vampiric Sliver (Sengir Vampire), Watcher Sliver (+0/+2) Five Mana Battle Sliver (+2/+0), Thorncaster Sliver (Hellrider), Brood Sliver (combat damage to a player, make a Sliver token), Dementia Sliver (tap, name a card, look at opponents hand and discard it), Lymph Sliver (absorb 1), Might Sliver (+2/+2), Psionic Sliver (Psionic Entity), Pulmonic Sliver (if dies, may put it ontop of owners library), Spitting Sliver (first strike), Synapse Sliver (combat damage to player, draw a card), Synchronous Sliver (vigilance), Vensers Sliver (vanilla colorless), Ward Sliver (protection from color of choice) Six Mana Megantic Sliver (+3/+3), Battering Sliver (trample), Fury Sliver (doublestrike) Seven Mana Groundshaker Sliver (trample) Wow, thats a lot of slivers

7: You get an emblem with Whenever you cast a spell, this emblem deals 5 damage to any target. Illustrated by Kieran Yanner Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Then there's Calhoun Marine Sergeant, who has a kamikaze ability that gains her 2 lore when she takes another character down

Ruby/Sapphire Into the Inklands Starter Deck Cogsworth - Talking Clock (x2) Della Duck - Unstoppable Mom (x3) Dewey - Showy Nephew (x2) Duke Weaselton - Small-Time Crook (x2) Flintheart Glomgold - Lone Cheater (x2) Flounder - Voice of Reason (x3) Gramma Tala - Keeper of Ancient Stories (x3) Gyro Gearloose - Gadget Genius (x1) HeiHei - Accidental Explorer (x3) Huey - Savvy Nephew (x1) Kakamora - Menacing Sailor (x3) Louis - Chill Nephew (x3) 003-150 (x2) Maui - Winged Demigod (x3) Minnie Mouse - Always Classy (x2) Moana - Born Leader (x1) Moana - Undeterred Voyager (x3) Scrooge McDuck - Richest Duck in the World (x1) Scrooge McDuck - Uncle Moneybags (x2) Simba - Scrappy Cub (x1) Webby Vanderquack - Enthusiastic Duck (x3) Dragon Fire (x2) Voyage (x2) Maui's Fish Hook (x1) Sumerian Talisman (x2) Vault Door (x2) Agrabah - Marketplace (x3) Motunui - Island Paradise (x2) Amber/Emerald Into the Inklands Starter Deck Cubby - Mighty Lost Boy (x3) Dalmatian Puppy - Tail Wagger (x5) 003-071 (x2) Flotsam - Riffraff (x2) Helga Sinclair - Vengeful Partner (x1) Horace - No-Good Scoundrel (x2) Jasper - Common Crook (x2) Jetsam - Riffraff (x2) Kida - Atlantean (x3) Kit Cloudkicker - Tough Guy (x2) Lucky - The 15th Puppy (x1) Nani - Protective Sister (x2) 003-014 (x3) Peter Pan - Lost Boy Leader (x1) Pluto - Determined Defender (x1) Pluto - Friendly Pooch (x3) Pongo - Determined Father (x1) Robin Hood - Daydreamer (x1) Rolly - Hungry Pup (x3) Starkey - Devious Pirate (x1) Tinker Bell - Generous Fairy (x2) Wendy Darling - Talented Sailor (x3) Wildcat - Mechanic (x2) Strike a Good Match (x2) Hypnotize (x2) Improvise (x3) 003-100 (x3) 003-032 (x2)

Cards that look better can easily become cards that fare better in rounds