Wight of the Reliquary + Agatha's Soul Cauldron + Bloodghast + Insidious Roots + Roar of Resistance

Wight of the Reliquary

Agatha's Soul Cauldron

Bloodghast

Insidious Roots

Roar of Resistance

How it works

1. Activate a creature you control that has a +1/+1 counter on it by tapping it and sacrificing Bloodghast, searching your library for a land card and putting it onto the battlefield tapped.
2. When the land enters, Bloodghast triggers, returning itself from your graveyard to the battlefield tapped.
3. Insidious Roots triggers, creating a 0/1 Plant creature token and then putting a +1/+1 counter on each Plant you control.
4. Repeat using the Plant instead until no lands are in your library.

This recursive loop turns your graveyard into a land-fetching engine by feeding Bloodghast to Wight of the Reliquary, which gains that activated ability courtesy of Agatha's Soul Cauldron granting it to creatures with +1/+1 counters. Every time Bloodghast leaves the graveyard, Insidious Roots triggers to produce a Plant token and seed it with a counter, which in turn fuels the Cauldron's color-fixing and ability-granting properties to keep the chain going. While Roar of Resistance might not drive the mechanical loop itself, its passive haste ensures your newly minted token army can rush into battle immediately.