Grenzo's doomsday machine 2.0 (EDH / Commander)

Previous iteration did not work, too slow. Now we are going with legacy-style hand disruption and tutors. Paths to victory in order of likelihood:

1. Get infinite mana, spam deck with Grenzo, combo out for infinite damage.
2. Early Doomsday stack. See description below.
3. Play long game by stacking bottom w high impact 2 power or less creatures via Surging Flame, scry effects, and hideaway lands, then using Grenzo. Random Grenzo activations can be fun too but not nearly as profitable. Hardcasting Ulamog and going to annihilation town is the last resort.

Combos:
Worldgorger Dragon+Animate Dead/Dance of the Dead/Necromancy+Grenzo on the field=infinite black and red mana w outlet to avoid a draw.
Viscera Seer+Mikaeus, the Unhallowed+Workhorse=infinite colorless
Use mana to activate Grenzo's ability until Triskelion ETB. Remove three counters to deal 2 damage to opponent and one to kill itself. Use Grenzo's ability to put library in yard/battlefield except Ulamog shuffles yard and library together. Keep using Grenzo's ability until Triskelion ETBs. Rinse and repeat for infinite, instant speed, uncounterable, undisruptable by Rest in Peace effects damage. Alternatively, also spam FTW with Viscera Seer and Gray Merchant. If the mana is red, Siege gang, sac and recast grenzo.

Doomsday stack (listed top to bottom so Workhorse is the bottom card):

1. [anything, probably some kind of control tech]
2. Zealous Conscripts
3. Mad Auntie
4. Kiki Jiki, Mirror Breaker
5. Workhorse

Just need 2BBB for infinite hasty creatures assuming Grenzo is on the field and none of ZC, KJ or WH are in hand. Cast Doomsday with the BBB, use the 2 to trigger Grenzo, ETB Workhorse. Remove two counters from Workhorse to activate Grenzo, ETB Kiki Jiki. Tap Kiki Jiki copying Workhose. Remove all four counters from the copy (or two from the original and two from the copy) to ETB a goblin lord. Grenzo is now 3/3. Use final 2 to ETB Zealous Conscripts. Swing for win.

Insidious Dreams stack (top to bottom):

1. Faithless Looting
2. Animate Dead
3. Worldgorger Dragon