Name:Horizon Stone
ManaCost:5
Types:Artifact
R:Event$ LoseMana | ValidPlayer$ You | ReplacementResult$ Replaced | ReplaceWith$ ConvertMana | ActiveZones$ Battlefield | Description$ If you would lose unspent mana, that mana becomes colorless instead.
SVar:ConvertMana:DB$ ReplaceMana | ReplaceType$ C
Oracle:If you would lose unspent mana, that mana becomes colorless instead.
