No, you do not draw a card when a creature dies.
No, casting a creature spell does not allow you to draw a card.
When a land becomes a creature and dies in a game, it is put into the graveyard as a land card, not a creature card.
When you activate the ability "draw a card for each creature you control," you draw a number of cards equal to the total number of creatures you control.
Mulldrifter is a creature with an enters-the-battlefield effect that allows you to draw a card when it enters the battlefield.
When the creature dies, its soul departs from its body.
When a Magic: The Gathering creature dies, it is put into the graveyard from the battlefield.
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.
If a creature in Magic: The Gathering dies and cannot be regenerated, it is put into the graveyard and is no longer on the battlefield.