See also
The best possible drawing hand is 7-4-3-2 offsuit. A pretty good drawing hand is 5-4-3-2 - and it is not an open-end Straight draw. Aces are always high, remember, so 5-4-3-2-A beats any Pair.
In low-ante games, you almost never draw two cards. If the players are very loose and have a lot of money on the table, you can think about drawing two cards from a late position. The more money your opponents have in front of them, the more you can capitalize if you do connect on a longshot draw.
Any two-card draw must have a Deuce in it.
Not only does this limit or eliminate your chances of making a Straight, you're holding the most desirable card your opponents could have in making their quality hands.
Another consideration is when you have small card duplication. For example, 7-7-3-2-2 would be an enticing two-card draw. It takes two good cards out of the deck which your opponents could use and it reduces the possibility of your pairing on the draw.
Another example of this concept would be a hand consisting of 7-3-2-2-2. Now THAT'S the best possible two-card draw. It's difficult for your opponent to have any quality Low hand without a Deuce in it - and there's only one Deuce left in the deck.
Now that wasn't difficult to reason out, was it? All the good players know not to draw one card to a Straight. But any time they draw to three small cards (3's through 7's) without a Deuce, they'll have a Straight draw whenever the first card drawn hits inside. For example, if you draw at 6-4-3 and the first card you look at is a Five, you now have a hand even a beginner wouldn't draw one card to. A Seven or a Deuce would make those four cards (6-5-4-3) a Straight. And the best possible hand you could make (when you looked at my fifth card) would be 8-6-5-4-3 - the ninth best hand in Deuce-to-Seven.
