Dire Undercurrents

Enchantment, 3{U/B}{U/B} (5)
Whenever a blue creature enters the battlefield under your control, you may have target player draw a card.

Whenever a black creature enters the battlefield under your control, you may have target player discard a card.¹
Illus. Franz Vohwinkel

Gatherer Card Rulings [Nov 2009]

• 5/1/2008: An object that's both of the listed colors will cause both abilities to trigger. You can put them on the stack in either order.

Format Legality	Legal in Vintage, Legacy, Extended, MTGO Classic Banned in Standard
Printings (1/10)	Shadowmoor (Rare)