Jund is a common Plane — Alara card from March of the Machine Commander (MOC), collector number 148. Current market price: $0.28, TCGplayer market prices via Scryfall.
Whenever a player casts a creature spell that's black, red, or green, it gains devour 5. (As that creature enters, you may sacrifice any number of creatures. It enters with five times that many +1/+1 counters on it.) Whenever chaos ensues, create two 1/1 red Goblin creature tokens.