Crossword Genius

Attainable diamonds regularly found here (2,3,5)

Ross

I believe the answer is:

on the cards

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'attainable' is the definition.
(something on the cards is viable or attainable)

I don't understand the remainder of the clue.

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(Other definitions for on the cards that I've seen before include "Where pips are" , "place for 6 19 [SEASONALMESSAGES]" , "Likely to happen" , "expected" , "Greetings may be" .)

I've seen this clue in The Times.
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