limber oxide
If a card’s probability is exceeded by two+ copies of Oops, All Sixes, it should occur as many times as that probability is exceeded. IE — if Bloodstone + 2 Oops, repeat the effect of Bloodstone twice (since it’s a 1/2 that becomes a 2/2 and then a 4/2.) For incomplete fractions, have it occur as a separate possibility — ie 15/10 means a 10/10 guaranteed effect and a 5/10 possible effect