To withdraw your winnings:
1. Make a deposit of $50 or more.
2. Spend the $100 in-game credit AND $50 of your deposited funds on card packs and marketplace purchases.
3. Craft predictions with a total prize card value of $150 or more.
You dont have to deposit any of your own funds to play with the in-game credit and there is no limit to what you can with using those funds. The deposit requirement is only to withdraw those funds.