Halo Fountain
Incubation Druid
Karn, the Great Creator

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
Halo Fountain and Incubation Druid do not have summoning sickness. Incubation Druid has at least one +1/+1 counter on it.

   Steps

How does this combo work?
1
Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Halo Fountain to become an artifact creature until end of turn.
2
Activate Incubation Druid's first ability by tapping it, adding .
3
Activate Halo Fountain's second ability by paying , tapping it and untapping it and Incubation Druid, causing you to draw a card.
4
Repeat from step 2.

   Results

What do I get from this combo?
Infinite card draw
Infinite draw triggers
Near-infinite colored mana
Near-infinite creature tokens
Near-infinite untap of creatures you control
Near-infinite mana creatures you control can produce
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