Chains of Mephistopheles + Dredger's Insight + Drogskol Reaver + Golgari Brownscale

Chains of Mephistopheles

Dredger's Insight

Drogskol Reaver

Golgari Brownscale

How it works

1. Attempt to draw a card.
2. The draw will be replaced by Chains of Mephistopheles, instead causing you to discard Golgari Brownscale. Then, the draw will be replaced by Golgari Brownscale's dredge ability, causing you to mill cards and return Golgari Brownscale from your graveyard to your hand.
3. Dredger's Insight's first ability triggers, causing you to gain 1 life.
4. Drogskol Reaver triggers, attempting to draw a card.
5. Repeat from step 2.

This intricate loop sets off a self-sustaining engine built around replacement effects and life-triggered card draw. Whenever Drogskol Reaver attempts to draw you a card, Chains of Mephistopheles steps in to force a discard of Golgari Brownscale instead, which conveniently triggers the dredge replacement ability to return Golgari Brownscale straight back to your hand. Meanwhile, Dredger's Insight quietly watches your graveyard and rewards you with life whenever cards leave it, which in turn causes Drogskol Reaver to draw another card and keep the whole chain turning.