Soul Diviner
Patchwork Crawler
Barrenton Medic

   Prerequisites

What do I need to start this combo?
Patchwork Crawler on the battlefield.
Soul Diviner and Barrenton Medic in exile (Soul Diviner and Barrenton Medic exiled by Patchwork Crawler in exile).
Patchwork Crawler does not have summoning sickness, and does not have a -1/-1 counter on it.

   Steps

How does this combo work?
1
Activate Patchwork Crawler using Barrenton Medic's second ability by putting a -1/-1 counter on it, untapping it.
2
Activate Patchwork Crawler using Soul Diviner's ability by tapping it and removing a -1/-1 counter from it, causing you to draw a card.
3
Repeat.

   Results

What do I get from this combo?
Infinite card draw
Infinite draw triggers