Against These FG's you can play your dragon as soon as you have the quanta for it. This will allow you to clear out your hand faster, and possibly shorten the game.
Akebono-dont hold me to this, but I believe he doesnt use acceleration on your creatures. You should be able to play both your dragon, and start the combo as soon as you want. IF someone knows differently let me know.
Divine Glory
Ferox
Gemeni-This is a mixed bag. DO NOT use mitosis until you can pull of the combo since there is a lobo. If you play your monster, then she will start chaining her phase shields making you have to use chimera. Ultimately its up to you how you do it. Its probably better to not play it so you can ditch the chimera.
Miracle
Paradox
Serket
Overall it wont make too much of a difference, but I thought Id mention them. I was bored.