To summon Miracles hit DON, DON DON, DON DON. Here are the Miracles you can unlock:
Attack Miracle - Defeat Invincible Dragon Majidonga lvl 3
Blizzard Miracle - Complete Watchtower and two Karmen Missions
Defense Miracle - Defeat Fearful Tentacle Monster Darachura lvl 3
Earthquake Miracle - Defeat Living Fortress Cannodears lvl 3
Rain Miracle - Complete Mushroom shroom shroom Nyokiri Swamp Mission / Second Time
Storm Miracle - Defeat God General of Staff Hookmen
Tailwind Miracle - Complete Mystery of the Desert's Sandstorm Mission / Second Time