To get the last chest card in Coin Master, start by buying wooden chests. Purchase these until you find a card with at least 3 stars. This sets a good foundation for your card collection.
Next, switch to gold chests once you have a 3-star card. Continue buying gold chests until your last card has 4-5 stars. This increases your chances of finding rarer cards.
After achieving cards with 4-5 stars, begin purchasing magical chests. These chests have the highest probability of containing the last card you need. Follow this sequence carefully to maximize your chances.
Also, buy chests during card booms and while in a boom village. These events significantly boost your chances of getting the last card. Be strategic with your purchases to complete your card collection efficiently.