Invasion uncommon. Dredge works a lot like the dredge ability on Golgari Grave-Troll. Throw some cards into the graveyard, and you get a card back. Dredge and dredge also create a combo: Play Dredge, sacrifice Golgari Grave-Troll, then replace the “draw a card” on Dredge with the Troll’s dredge ability to mill yourself for six and put the Troll back into your hand, ready to be played again bigger than ever.
