Donat, Doomsday Harbing

Dregde 5 (If you would draw a card, you may mill five cards instead. If you do return this card from your graveyard to your hand.)
If your library has 20 or fewer cards, all other creatures you control gain Toxic 1 (Players dealt combat damage by this creatures also get a poison counter.)
If you library has 10 or fewer cards all creatures you control gain Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in te form of poison counters).