The Black Dawn is a free tutor each upkeep for a loss of life, and that's potent in a 40 life format
I wont bury the lede here: I love the dice-rolling mechanics that Adventures in the Forgotten Realm s brought us, but I think they missed the mark from a power-level perspective

Agency Outfitter Ajani's Aid Analyze the Pollen Ancient Vendetta Angrath's Fury Ashiok's Forerunner Auditore Ambush Basri's Aegis Blood Speaker Boonweaver Giant Boseiju Reaches Skyward Burning-Rune Demon Call the Mountain Chocobo Chandra's Firemaw Chandra's Flame Wave Chandra's Outburst Chandra, Heart of Fire Clay-Fired Bricks Counterbore Cranial Extraction Crumble to Dust Dark Petition Dark Supplicant Deadly Cover-Up Deicide Delivery Moogle Demonic Counsel Dina's Guidance Dispossess Domri's Nodorog Dovin's Dismissal Elspeth's Devotee Eradicate Eternal Dragon Ethereal Elk Evolution Charm Extirpate Fang-Druid Summoner Final Parting Fork in the Road From Father to Son Frostpyre Arcanist Garruk's Warsteed Garruk, the Veil-Cursed Gate to the Afterlife Gideon's Battle Cry Gideon's Resolve Gifts Ungiven Goldmane Griffin Grand Master of Flowers Grasping Current Grave Upheaval Grim Reminder Grinning Totem Hoarding Dragon Horizon Spellbomb Iname as One Increasing Ambition Infernal Rebirth Infinite Obliteration Intuition Invasion of Arcavios Invasive Surgery Jace's Ruse Jarad's Orders Journey for the Elixir Kassandra, Eagle Bearer Kotose, the Silent Spider Landscaper Colos Liberating Combustion Liliana's Influence Liliana's Scorn

Divination is the classic example, since you use one card to draw two
Unable to be ushered into rest, many spirits now cling to the world of the living instead of finding their way to the Blessed Sleep
Cards like Fatal Push that care about mana value will see embalmed tokens as having mana value 0