From most to least valuable:
				
Raigeki (11 minutes)
Takuhee (8.5 minutes)
Toon Alligator (8 minutes)
Hourglass of Courage (6 minutes)
Barrel Lily (6 minutes)
Mega Thunderball (5 minutes)
Malevolent Nuzzler (5 minutes)
Follow Wind (4.5 minutes)
Beast Fangs (4.5 minutes)
Dark Energy (4.5 minutes)
Horn of the Unicorn (3.5 minutes)
Raise Body Heat (3 minutes)
Legendary Sword (3 minutes)
Flame Viper (3 minutes)
Dragon Treasure (2.5 minutes)
Horn of Light (2.5 minutes)
Greenkappa (2 minutes)
Dragon (2 minutes)
Thunder besides Mega Thunderball (2 minutes)