'Generate a lot of creatures' is a popular and surprisingly successful strategy in Vintage. This card can single-handedly address this vulnerability. However, this card is narrow, slow, and fragile (unfortunately sharing a toughness with Containment Priest in particular).
Consider splitting your deck into two piles: those your opponent would bin and those she will let you keep at any moment in time.
Contrast drawing a card. Sin Prodder's ability's value is the weighted average of the converted mana cost in damage of the binned pile plus the in-hand value of the kept pile.
Plainly, the ability shines when your bad cards are good and your good cards are expensive.