Sheoldred itself is a monster once played and dont be surprised if you find yourself rarely transforming it
Cast Phyrexian Dreadnought for one mana upside down, or tutor it up with Demonic Tutor if you don't have it already
Discover is close enough to cascade that Dinosaur Egg and Hit the Mother Lode help this deck do it's thing

3 Blood Spatter Analysis Boggart Cursecrafter Bullseye, Death Dealer Carnage, Crimson Chaos Chaos Spewer Chaos, the Endless Cindering Cutthroat Coalstoke Gearhulk Crash, Reckless Endrider Cruel Administrator Deadly Complication Desecrex, Gift of Servitude Disturbing Mirth Eclipsed Boggart Far Fortune, End Boss Fireglass Mentor Garland, Knight of Cornelia Garna, Bloodfist of Keld Gastal Thrillseeker Gev, Scaled Scorch Green Goblin, Revenant Grub's Command Immersturm Predator Interceptor Mechan Judith, Carnage Connoisseur Kivni, Orb Weaver Knife Trick Kuja, Genome Sorcerer Laughing Jasper Flint Madame Hydra Molten Collapse Mutinous Massacre Nu and Sumi, Career Criminals Ozai, the Phoenix King Perforating Artist Pumpkin Bombardment Push // Pull Rakdos Joins Up Rakdos, Patron of Chaos Rakdos, the Muscle Rowan, Scion of War Rune-Brand Juggler Ruzic, Booed but Victorious Sawblade Skinripper Scarlet Spider, Kaine Shadow Urchin Shady Informant Shriek, Treblemaker The Infamous Cruelclaw The Ruinous Wrecking Crew Tokka & Rahzar, Terrible Twos Totentanz, Swarm Piper Trance Kuja, Fate Defied Ultimate Green Goblin Undead Sprinter Vial Smasher, Gleeful Grenadier Vindictive Warden Zhao, Ruthless Admiral Zoyowa Lava-Tongue Zuko, Conflicted

Thats why were here to explain how the mechanic works, how you level up The Ring, and how to sort out the odd rule interactions that might have you confused
It's not an opinion, but a fact that Pokmon cards can go for a lot of money