Using a rigged roulette wheel.
False deals: A dealer may be able to deal the second card from the top (used in conjunction with marked cards), or the ability to deal the bottom card of the deck (used in conjunction with placing desirable cards at the bottom of the deck.)
False shuffles and cuts: A dealer may seem to mix or cut the cards, while retaining certain cards or the whole deck in a desired order.
Using a deck of cards with non-standard composition.