Let's just take the time to ask ourselves what makes a hybrid mana card a good card.
The way i make mine I hope is the correct way to use hybrid mana. I bascily make all ablilites on the card match both the colors on my hybrid mana symbol. So bascily both the colors I use can do it on there own but you only need to have one or the other to pay it.
I only do two because it's simple. I have not yet made a pay ability hybrid card yet. Most likely will in the future.
What do you think makes a good hybrid card?