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When Golgari Thug dies, put target creature card from your graveyard on top of your library.
Dredge 4 (If you would draw a card, you may mill four cards instead. If you do, return this card from your graveyard to your hand.)
Dredge lets you replace any card draw, not just the one during your draw step.
Once you decide to replace a draw using a card’s dredge ability, that card can’t be removed from your graveyard “in response.” (Replacement effects don’t use the stack.)
You can’t use dredge unless you’re going to draw a card and the card with dredge is already in your graveyard.
