2 cards where the text includes “poisonous”

Snake Cult Initiation (Future Sight #89)

Snake Cult Initiation {3}{B}

Enchantment — Aura

Enchant creature

Enchanted creature has poisonous 3. (Whenever it deals combat damage to a player, that player gets three poison counters. A player with ten or more poison counters loses the game.)

Illustrated by Justin Sweet

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Virulent Sliver (Time Spiral Remastered #246)

Virulent Sliver {G}

Creature — Sliver

All Sliver creatures have poisonous 1. (Whenever a Sliver deals combat damage to a player, that player gets a poison counter. A player with ten or more poison counters loses the game.)

1/1

Illustrated by Franz Vohwinkel

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny

In the blink of an eye, they strode from deep snow to the end of this search.