Mortuary + Grim Haruspex + Shifting Wall

Mortuary

Grim Haruspex

Shifting Wall

How it works

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

This clever loop relies on casting Shifting Wall for zero mana, letting state-based actions instantly send it to the graveyard due to having zero toughness. Whenever this happens, Mortuary steps in to neatly tuck Shifting Wall back onto the top of your library instead of letting it rest. Meanwhile, Grim Haruspex watches the creature die and rewards you by drawing a card, which conveniently puts Shifting Wall right back into your hand to repeat the cycle indefinitely.