The Necrobloom is a perfect support piece since dredge lets you easily bring the lands that you sacrifice and mill back
They dont like it when we know all of that, so they try to hide a lot of it, but they are required by assorted laws to print your odds for each potential pull
Its always a struggle to find that line between Casual and Powerful. These are reasonably strong pre-cons that are in the Goldilocks zone of not too strong for casual and not too weak against focused decks

Abian, Luvion Usurper (playtest) Abzan Ascendancy Abzan Monument Afterlife Afterlife Insurance Akki Ember-Keeper Alharu, Solemn Ritualist Anafenza, Unyielding Lineage Architect of Restoration Avacyn's Collar Avatar Kuruk Baboon Spirit Baku Altar Beckon Apparition Bishop of Wings Blessed Defiance Brine Comber Brinebound Gift Broken Visage Ceaseless Conflict Chishiro, the Shattered Blade Clarion Spirit Cleaver Blow (playtest) Concord with the Kami Court of Grace Custodi Soulbinders Dauntless Cathar Daxos the Returned Descendant of Storms Donal, Herald of Wings Doomed Traveler Dorothea's Retribution Dripping-Tongue Zubera Drogskol Cavalry Dusyut Earthcarver Elgaud Inquisitor Emissary of the Sleepless Ethereal Absolution Ethereal Investigator Evil Boros Charm (playtest) Field of Souls Foggy Swamp Spirit Keeper Forbidden Orchard Fortress Kin-Guard Funeral Pyre Gallows at Willow Hill Garrison Excavator Geist Snatch Ghastly Mimicry Ghostly Dancers Gift of Wrath Go-Shintai of Shared Purpose Gods' Eye, Gate to the Reikai Goro-Goro and Satoru Goro-Goro, Disciple of Ryusei Great Arashin City Group Project Hallowed Haunting Hanged Executioner Haunted Dead Haunted Library Haunting Imitation Hei Bai, Forest Guardian Hofri Ghostforge Honden of Life's Web Illuminate History Illustrious Historian Imperious Oligarch Indebted Spirit Inspirited Vanguard Kaya the Inexorable Kaya's Guile

Frantic Firebolt isn't put into your graveyard until after it finishes resolving, so it doesn't count itself for its own effect
Choosing the right art can take a design thats an 8/10 and jump it to a 10/10 status