Devourer of Knowledge

Delirium- At the beginning of each upkeep, if there are four or more card types among cards in your graveyard, each player discards a card.
Whenever any player discards a card, put a +1/+1 counter on Devourer of Knowledge.
"If a soldier returns from war with Phyrexia unable to speak, but show no visible scars or battle wounds, quarantine them immediately." -Mirrodin Battlemedics Code Vol. 3, Page 38