Cloud of Darkness

Legendary Creature — Avatar

Flying

Particle Beam — When this enters, target creature an opponent controls gets -X/-X until end of turn, where X is the number of permanent cards in your graveyard.

Legality

Format	Legality
1v1 Commander	Legal
Alchemy	Legal
Archenemy	Legal
Arena	Legal
Block Constructed	Legal
Canadian Highlander	Legal
Casual	Legal
Commander / EDH	Legal
Commander: Rule 0	Legal
Custom	Legal
Duel Commander	Legal
Freeform	Legal
Gladiator	Legal
Highlander	Legal
Historic	Legal
Historic Brawl	Legal
Legacy	Legal
Leviathan	Legal
Limited	Legal
Modern	Legal
Modern Beyond Horizons	Legal
Oathbreaker	Legal
Pioneer	Legal
Planar Constructed	Legal
Planechase	Legal
Pre-release	Legal
Quest Magic	Legal
Standard	Legal
Standard Brawl	Legal
Vanguard	Legal
Vintage	Legal