here are the percentage breakdowns of the symbols on the dice and some conversion suggestions.
tri
miss 12 40%
orb 6 20%
rout 4 13.3%
hit 8 26.6%
recommendation use d10 1-4=miss 5=rout 6-8=hit 9-0 orb
square
miss 9 30%
orb 6 20%
rout 3 10%
2rout 2 06.6%
hit 6 20%
2hit 4 13.3%
recommendation use d10 1-3=miss 4=1rout 5=2rout 6-7=hit 8=2hits 9-0 orb
hex
miss 6 20%
orb 6 20%
rout 1 3.3%
2rout 5 16.6%
hit 5 16.6%
2hit 4 13.3%
3hit 3 10%
recommendation use d20 1-4=miss 5=rout 6-8=2rout 9-11=hit 12-14=2hit 15-16=3hit 17-20 orb
circle
miss 12 40%
orb 12 40%
rout 2 6.6%
hit 4 13.3%
recommendation use d20 1-8=miss 9=rout 10-12=hit 13-20 orb
symbols
gold 4 13.3%
silver8 26.6%
red 18 60%
recommendation use d8 1-5=red 6-7=grey 8=gold
dice odds
d20 5%
d12 8.3%
d10 10%
d8 12.5%
d6 16.6%
Or you can avoid all of this with a d30 and map possibilities 1to1 there as there are only 30 cards. If you can find a d30.