Kenrith, the Returned King + Smothering Tithe + Doubling Season + Xorn

Kenrith, the Returned King

Smothering Tithe

Doubling Season

Xorn

How it works

1. Activate Kenrith's fourth ability by paying 3, causing an opponent who cannot pay for Smothering Tithe's trigger to draw a card.
2. Smothering Tithe triggers, causing you to create four Treasure tokens due to Doubling Season and Xorn.
3. Activate the Treasures by tapping and sacrificing them, adding 3.
4. Repeat.

This clever loop turns Kenrith, the Returned King into a self-sustaining engine by utilizing Smothering Tithe to tax opponents every time they draw a card. Because Doubling Season doubles the tokens you would create and Xorn tacks on an extra Treasure, every single forced card draw yields four precious Treasures instead of just one. Sacrificing those Treasures easily pays the mana required to activate Kenrith's card-drawing ability again, fueling an endless cycle that buries your opponents in infinite draws and artifact triggers.