Ratadrabik of Urborg + Leyline of Singularity + Spore Frog

Ratadrabik of Urborg

Leyline of Singularity

Spore Frog

How it works

1. Activate Spore Frog by sacrificing it.
2. When Spore Frog dies, Ratadrabik triggers, creating a token copy of Spore Frog that is a 2/2 legendary Zombie in addition to its other types.
3. Resolve the Spore Frog ability.
4. Repeat using the Spore Frog token

By turning every nonland permanent into a legendary permanent, Leyline of Singularity rewrites the rules of the battlefield so that humble creatures like Spore Frog become legendary targets for Ratadrabik of Urborg. When you sacrifice the Frog to lock down all combat damage for the turn, Ratadrabik steps in to create a non-legendary copy that is also a Zombie, which itself remains legendary thanks to the Leyline's global enchantment effect. This lets the Spore Frog token repeat the exact same sacrifice loop indefinitely, establishing an unbreakable fog lock while generating endless death and sacrifice triggers.