Glistening Sphere [Phyrexia: All Will Be One Commander] Adventure Each opponent can't cast more

Each opponent can't cast more than one spell each turn

a 2-card Collector Booster Sample Pack

it gets -4/+4 until end of turn

Kjeldoran royal mage

Set: Torment Type: Instant Rarity: Rare Cost: {3}{B} As an additional cost to cast this spell

Glistening Sphere [Phyrexia: All Will Be One Commander] Adventure Each opponent can't cast moreSet: Phyrexia: All Will Be One Commander Type: Artifact Rarity: Rare Cost: {3} Glistening Sphere enters the battlefield tapped. When Glistening Sphere enters the battlefield, proliferate. T: Add one mana of any color. Corrupted T: Add three mana of any one color. Activate only if an opponent has three or more poison counters.