MTG Card Sphere of Annihilation
Formats and restrictions
Text of card Sphere of Annihilation
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.
Rules and information for Sphere of Annihilation
If a permanent on the battlefield or a card in a graveyard has in its mana cost, X is 0 when determining that card's mana value.