2 grav nymphs must be a nice drain deck
Grav nymphs aren't as nice as people hold them to be, sure, they have great potential, but by the time you have one on the field almost any rush could already have won, or you throw in a few black holes as well to prevent that and lack damage potential.
I've tried a lot of decks with these nymphs, but none of them fit my style. Maybe I just need even more