Boggart Mischief is a uncommon Kindred Enchantment — Goblin card from Lorwyn Eclipsed (ECL), collector number 92. Current market price: $0.34 (foil $0.45), TCGplayer market prices via Scryfall.
When this enchantment enters, you may blight 1. If you do, create two 1/1 black and red Goblin creature tokens. (To blight 1, put a -1/-1 counter on a creature you control.) Whenever a Goblin creature you control dies, each opponent loses 1 life and you gain 1 life.