Yes it can a wild card can be played on any card, especially if you have another playable card in your hand
No, a wild card cannot stop a Draw 2 in a game of Uno.
No, you cannot put a wild card on a Draw 2 in the game of Uno.
No, you cannot stack a Draw 4 on a Draw 2 in Uno.
When a player is required to draw cards due to both the Uno rules of "Draw 4" and "Draw 2" being played in succession, they must draw a total of 6 cards.
8 total: 4 normal wild cards and 4 draw four wild cars
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 a reverse on a Draw 2 card in Uno.
No, it is a card game. Uno can either be played with the special trademarked deck of cards, or by using the numbered cards in a standard poker deck and assigning functions (skip, draw 2, etc) to face cards, aces and wild cards.