When clicking on the (?) icon for this scratch card it says
Here are the possible gains:
5 credits
10 credits
25 credits
50 credits
1 Free card (randomly picked up from the cards you don't own yet)
One of the special event cards
But
@Celine 's post says
Here are the possible gains :
10 credits
50 credits
100 credits
1 Free card (randomly picked up from the cards you don't own yet)
One of the special event cards including BELKA !
They disagree about the possible rewards and neither mentions the 20 credits that I won 5 times (apparently as a substitute for a 1 card win).
@Celine's post seems to be the more accurate because I say, but did not win, a 100 credit prize.