On the cards
Definition 1 of 1
Pro Tip 1/3Implied Expectations
Use when expressing something that is anticipated because of previous events or situations. 
After the success of her last novel, a sequel was certainly on the cards.
Pro Tip 2/3Figurative Meaning
'On the cards' is a metaphor suggesting the prediction of events, as if foretold by cards, like in tarot readings. 
With dark clouds gathering, rain seems to be on the cards.
Pro Tip 3/3Casual Tone
The phrase is informal and is best suited for casual conversations, not for formal or official contexts. 
Considering how well you've played, a win is on the cards.