Golgari Brownscale + Thran Vigil Combos

Combo 1 with Benthic Biomancer

Steps

1. Put a +1/+1 counter on Benthic Biomancer.
2. Benthic Biomancer triggers, causing you to mill two cards and return Golgari Brownscale from your graveyard to your hand, and then causing you to discard Golgari Brownscale.
3. Thran Vigil triggers, putting a +1/+1 counter on Benthic Biomancer.
4. Repeat from step 2.