Ruthless Invasion

Official Ruling

Phyrexian mana is not a new color. Players can't produce Phyrexian mana.

Official Ruling

As you cast a spell or activate an activated ability with one or more Phyrexian mana symbols in its cost, you choose how to pay for each Phyrexian mana symbol at the same time you would choose modes or choose a value for X.

Official Ruling

If you're at 1 life or less, you can't pay 2 life.

Official Ruling

To calculate the mana value of a card with Phyrexian mana symbols in its cost, count each Phyrexian mana symbol as 1.

Official Ruling

A card with Phyrexian mana symbols in its mana cost is each color that appears in that mana cost, regardless of how that cost may have been paid.