Phyrexia: All Will Be One

Distorted Curiosity | Sorcery | | Corrupted — This spell costs {2} less to cast if an opponent has three or more poison counters. Draw two cards. | Svetlin Velinov

Infectious Inquiry | Sorcery | | You draw two cards and you lose 2 life. Each opponent gets a poison counter. | Eli Minaya

Carnivorous Canopy | Sorcery | | Destroy target artifact, enchantment, or creature with flying. If that permanent's mana value was 3 or less, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) | John Di Giovanni

Viral Spawning | Sorcery | | Create a 3/3 green Phyrexian Beast creature token with toxic 1. (Players dealt combat damage by it also get a poison counter.) Corrupted — As long as an opponent has three or more poison counters and Viral Spawning is in your graveyard, it has flashback {2}{G}. (You may cast this card from your graveyard for its flashback cost. Then exile it.) | Denis Zhbankov