Spontaneous Mutation
Enchantment — Aura
Flash
Enchant creature
Enchanted creature gets -X/-0, where X is the number of cards in your graveyard.
Legalities
- brawl: banned
- commander: legal
- legacy: legal
- modern: legal
- pauper: legal
- standard: banned
- vintage: legal
- pioneer: legal
Rulings
- 2020-11-10:
The value of X will constantly update as the number of cards in your graveyard changes.