Umori, the Collector Combos
Amareth, the Lustrous + Sensei's Divining Top + Umori, the Collector
Birgi, God of Storytelling // Harnfel, Horn of Bounty + Sensei's Divining Top + Umori, the Collector
Composite Golem + Enduring Renewal + Umori, the Collector
Sensei's Divining Top + Magus of the Future + Umori, the Collector
Sensei's Divining Top + One with the Multiverse + Umori, the Collector
The Reality Chip + Sensei's Divining Top + Umori, the Collector
Umori, the Collector + Acererak the Archlich + Gwenna, Eyes of Gaea
Combo result
Infinite card draw. Infinite draw triggers. Near-infinite damage. Near-infinite Treasure tokens. Near-infinite colored mana. Near-infinite +1/+1 counters. Near-infinite ETB. Near-infinite LTB. Near-infinite lifegain. Near-infinite lifegain triggers. Near-infinite lifeloss. Near-infinite storm count. Near-infinite ventures into the dungeon.
Prerequisites
Acererak in hand. All other permanents on the battlefield. You have not completed nor are currently venturing in Tomb of Annihilation. Gwenna does not have summoning sickness. Umori naming "Creature".
Umori, the Collector + Circuit Mender + Mortuary
Umori, the Collector + Elsha of the Infinite + Sensei's Divining Top
Umori, the Collector + Experimental Frenzy + Sensei's Divining Top
Umori, the Collector + Filigree Familiar + Mortuary
Umori, the Collector + Future Sight + Sensei's Divining Top
Umori, the Collector + Imotekh the Stormlord + Spine of Ish Sah
Umori, the Collector + K'rrik, Son of Yawgmoth + Aetherflux Reservoir
Combo result
Infinite damage. Infinite +1/+1 counters on K'rrik. Infinite lifegain. Infinite lifegain triggers. Infinite storm count.
Prerequisites
Mourning in hand. All other permanents on the battlefield. "Enchantment" chosen with Umori. Your life total is at least nine if your storm count is equal to zero, at least six if your storm count is equal to one, at least four if your storm count is equal to two, or at least three otherwise.