Karn, Silver Golem
Chromatic Orrery
Umbral Mantle

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
Chromatic Orrery does not have summoning sickness.

   Steps

How does this combo work?
1
Activate Chromatic Orrery's first ability by tapping it, adding 5.
2
Activate Karn by paying 1, causing Chromatic Orrery to become an artifact creature until end of turn.
3
Activate Umbral Mantle's equip ability by paying 0, attaching it to Chromatic Orrery.
4
Activate Chromatic Orrery by paying 3 and untapping it, giving it +2/+2 until end of turn.
5
Activate Chromatic Orrery's first ability by tapping it, adding 5.
6
Repeat from step 4.
7
Once you have infinite mana, you may instead use Chromatic Orrery's second ability if you control a colored permanent.

   Results

What do I get from this combo?
Infinite card draw
Infinite colored mana
Infinite colorless mana
Infinite draw triggers
Infinitely large creature until end of turn
Infinite untap of creatures you control
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