***New Mechanic: Phyrexian Mana Symbols***

Under Phyrexian rule, the very nature of magic is changing. In some cases, blood works just as well as mana. Phyrexian mana allows players to cast spells and activate abilities with fewer mana and to ignore colored mana requirements.

Visually, each Phyrexian mana symbol looks like the Phyrexian insignia (a circle with a slash through it) on one of five colored backgrounds, each corresponding to one of the five colors of mana. Each Phyrexian mana symbol represents a cost that can be paid in two ways: by spending one mana of the color that matches the colored background or by paying 2 life. For example, {G/P} can be paid with either {G} or 2 life. It's a green mana symbol.

example card:



Surgical Extraction (ϕB)
Instant (Rare)
(ϕ can be payed with either B or 2 life)
Choose target card in a graveyard other than a basic land card. Search its owner's graveyard, hand, and library for any number of cards with the same name as that card and exile them. Then that player shuffles his or her library.

source: New Phyrexia's Buy-a-Box card : Daily MTG : Magic: The Gathering