NO.
you draw straight lines with a ruler
In poker, a straight draw is when a player has four cards in sequence and needs one more card to complete a straight. This impacts a player's strategy by giving them a chance to make a strong hand if they hit the needed card. Players with straight draws may choose to stay in the game and continue betting in hopes of completing their straight, or they may fold if the odds are not in their favor.
No, you cannot put a Draw 4 card on top of a Draw 2 card in Uno.
No, you cannot put a Draw 2 card on top of a Draw 4 card in Uno.
No, you cannot put a Draw 4 card on top of a Draw 2 card in Uno.
No, you cannot stack a Draw 2 card on top of a Draw 4 card in Uno.
No, you cannot stack a Draw 4 card on top of a Draw 2 card in Uno.
No, you cannot put down a Draw 4 card on top of a Draw 2 card in the game.
No, you cannot stack a Draw 4 card on top of a Draw 2 card in the game of Uno.
Yes, you may do that.
No, you do not draw a card when a creature dies.
I looked up and I think you use them to draw graphs but can use them to draw straight lines.