Historical Rules · 30 September 2011
Rule 117.7d
Official source text from the 30 September 2011 Rules release
If a cost is reduced by an amount of mana represented by a Phyrexian mana symbol, the cost is reduced by one mana of that symbol's color.
Historical Rules · 30 September 2011
Official source text from the 30 September 2011 Rules release
If a cost is reduced by an amount of mana represented by a Phyrexian mana symbol, the cost is reduced by one mana of that symbol's color.