Sphere of Annihilation
Artifact
Sphere of Annihilation enters the battlefield with X void counters on it.
At the beginning of your upkeep, exile Sphere of Annihilation, all creatures and planeswalkers with mana value less than or equal to the number of void counters on it, and all creature and planeswalker cards in graveyards with mana value less than or equal to the number of void counters on it.
Legalities
- commander: legal
- legacy: legal
- modern: legal
- pauper: legal
- vintage: legal
- brawl: legal
- pioneer: legal
- standard: legal
Rulings
- 2021-07-23:
If a permanent on the battlefield or a card in a graveyard has {X} in its mana cost, X is 0 when determining that card's mana value.