Sensei's Divining Top + Bolas's Citadel + Horizon Chimera

Sensei's Divining Top

Bolas's Citadel

Horizon Chimera

How it works

1. Activate Sense's Divining Top's second ability by tapping it, causing you to draw a card and put Sensei's Divining Top on top of your library from the battlefield.
2. Horizon Chimera triggers, causing you to gain 1 life
3. Cast Sensei's Divining Top from the top of your library by paying 1 life.
4. Repeat.

This elegant loop turns the top of your deck into a self-sustaining engine by letting Bolas's Citadel bypass mana costs entirely, replacing them with life payments instead. You can repeatedly tap Sensei's Divining Top to draw a card and place itself back on top of your library, where Bolas's Citadel lets you recast it immediately for just 1 life. Meanwhile, Horizon Chimera acts as the ultimate life buffer, its static triggered ability granting you 1 life every time you draw a card to completely offset the life cost of recasting Sensei's Divining Top over and over again.