Ghostly Prison [Planechase Anthology] Map instead you get one poison

instead you get one poison counter and you can't get additional poison counters this turn

Set: The Lost Caverns of Ixalan Commander Type: Artifact Rarity: Uncommon Cost: {3} Worn Powerstone enters the battlefield tapped

The only ride not explicitly mentioned in the Astrotorium waiver

Your opponents can't cast spells during combat

If that card has the chosen name

Ghostly Prison [Planechase Anthology] Map instead you get one poisonSet: Planechase Anthology Type: Enchantment Rarity: Uncommon Cost: {2}{W} Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you. "May the memory of our fallen heroes ensnare the violent hearts of lesser men." Great Threshold of Monserkat inscription