**Spectral Procession**and the likes).

Basically, you can't pay the colorless "part" of the mana cost with coloured mana, you have to use real *colorless* mana.

It means you can't cast

**Spectral Procession**for BBWW for instance.

Attached is my attempt at fixing this by updating

*ManaCost::tryToPayHybrids*, which, in its current state, could not handle colorless hybrid.

Using this code, I've been able to cast

**Spectral Procession**with the following manapools.

- 6 non-white mana
- 5 mana (including 1 white)
- 4 mana (including 2 white)
- 3 white

Code: Select all

```
/**
starting from the end of the array (diff)
*/
int ManaCost::tryToPayHybrids(std::vector<ManaCostHybrid>& _hybrids, int _nbhybrids, std::vector<int16_t>& diff)
{
if (!_nbhybrids)
return 1;
int result = 0;
ManaCostHybrid& h = _hybrids[_nbhybrids - 1];
if (diff[h.color1 * 2 + 1] >= h.value1)
{
diff[h.color1 * 2 + 1] -= h.value1;
result = tryToPayHybrids(_hybrids, _nbhybrids - 1, diff);
if (result)
return 1;
diff[h.color1 * 2 + 1] += h.value1;
}
if (diff[h.color2 * 2 + 1] >= h.value2)
{
diff[h.color2 * 2 + 1] -= h.value2;
result = tryToPayHybrids(_hybrids, _nbhybrids - 1, diff);
if (result)
return 1;
diff[h.color2 * 2 + 1] += h.value2;
}
if (h.color1 == Constants::MTG_COLOR_ARTIFACT && h.value1 > 0)
{
int colorlesscost = h.value1;
vector<int16_t> diffcopy;
diffcopy.resize((Constants::NB_Colors + 1) * 2);
diffcopy[Constants::NB_Colors * 2] = Constants::NB_Colors;
for (int i = 0; i < Constants::NB_Colors*2; i++)
{
diffcopy[i] = diff[i];
}
for (int i = 0 ; i <= Constants::MTG_COLOR_LAND ; i++)
{
if (colorlesscost <= diffcopy[i * 2 + 1]) {
diffcopy[i * 2 + 1] -= colorlesscost;
colorlesscost = 0;
}
else
{
//update what's left to pay & empty that mana pool's color
colorlesscost -= diffcopy[i * 2 + 1];
diffcopy[i * 2 + 1] = 0;
}
}
if (colorlesscost == 0) {
//we paid the whole cost, update the real mana cost and proceed
for (int i = 0; i < Constants::NB_Colors*2; i++)
{
diff[i] = diffcopy[i];
}
result = tryToPayHybrids(_hybrids, _nbhybrids - 1, diff);
if (result)
return 1;
}
}
return 0;
}
```

**Reaper King**...