There is only one Pure Hybrid Dragon for each pairing of Pure with
another element except in the case of Ivory, which was recently added
and is Terra + Pure to go along with Pure Terra’s Pure + Terra. This
makes the old Pure Elementals much easier to breed if you already have
a Pure dragon. It’s 100% sure to get the corresponding Pure Hybrid by
breeding Pure + [corresponding Elemental] in every case except for using Terra.
For instance, Pure + Flame is 100% Pure Flame. There are no other possible
results at least until more Pure hybrids are released.
There are no Pure Hybrids yet to match Pure with Light, War, or Legend.