Mortuary + Grim Haruspex + Chamber Sentry

Mortuary

Grim Haruspex

Chamber Sentry

How it works

1. Cast Chamber Sentry by paying 0.
2. Chamber Sentry enters and dies as a state-based action due to having 0 toughness, triggering Mortuary and Grim Haruspex.
3. Resolve the Mortuary trigger, putting Chamber Sentry from your graveyard onto the top of your library.
4. Resolve the Grim Haruspex trigger, causing you to draw a card, thus drawing Chamber Sentry from your library.
5. Repeat.

This clever loop relies on casting Chamber Sentry for zero mana, allowing state-based actions to immediately send it to the graveyard. Mortuary steps in to catch the creature as it dies, neatly stacking it back on top of your library so that Grim Haruspex can trigger and draw it right back into your hand. Because Chamber Sentry enters the battlefield with zero toughness due to its lack of mana spent, the cycle resets instantly, feeding you an endless chain of draws, death triggers, and storm count without ever needing to spend another drop of mana.