Newer collectors can relate this to the Amazing Rares from Sword & Shield Vivid Voltage or the Prism Stars from the Sun & Moon era
The secondary effect has no downside or additional cost, meaning that the only thing required to get incremental bonuses of 40 damage is a bit of luck on the coinflips

Awaken the Erstwhile Balancing Act Chandra Ablaze Creeping Dread Cunning Lethemancer Dark Deal Delirium Skeins Dragon Mage Earsplitting Rats Enemy of Enlightenment Fanatic of the Harrowing Flux Gutmorn, Pactbound Servant Ill-Gotten Gains Incendiary Command Jace's Archivist Kardur's Vicious Return Kefka, Court Mage Largepox (playtest) Liliana of the Veil Liliana, Defiant Necromancer Liliana, Waker of the Dead Magus of the Jar Magus of the Wheel Marsh Crocodile Memory Jar Miasmic Mummy Mindlash Sliver Mindslicer Naktamun Lorespinner Neheb, the Worthy Rankle's Prank Rankle, Master of Pranks Reforge the Soul Rix Maadi, Dungeon Palace Rotting Rats Runehorn Hellkite Seek Bolas's Counsel (playtest) Sensation Gorger Serum Raker Sibsig Icebreakers Sire of Insanity Strategy, Schmategy Strongarm Tactics Stronghold Rats Wheel of Fate Wheel of Fortune Whispering Madness Windfall
Tinkaton EX: 160 DMG from only 1 heads
Both the BB recursive dorks are there primarily to help get back Amalgam although they are fine for some nibble damage and as sacrificial dudes
I know that Golgari life gain is supported enough that this is less off-beat than some of the other decks proposed, but this article is already long enough without me including a section arguing for and against each of the options