Make sure you choose the Chick for this as this creature has the fastest learning rate.

Here is a good creature changer! Use exploits to teach your creature the Mega-Blast miracles unless you wish to lose your sanity.
https://forum.bwgame.net/downloads/creaturestats.189/

Exploit tutorial:
1. Switch your creature to the chick.
2. Teach your creature atleast 1% of all the miracles you want him to know.
3. Switch your creature to the leopard at the creature breeder.
4. Edit your creature in a creature editor and change it back into the chick.
5. Repeat step 3 to 4 until your creature knows all miracles you want him to know.