At the beggining of your upkeep, you lose 1 life and amass Phyrexians 1. (Put a +1/+1 counter on an Army you control. It's also a Phyrexian. If you don't control an Army, create a 0/0 black Phyrexian Army creature token first.)

Whenever a Phyrexian token you control attacks, if it has power 6 or greater, it gains infect until end of turn. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)