Point taken.
Essentially, there needs to be an increased quanta cost to cover the 2 additional upgrades. *coughSoSe* 14

sounds about right, given the following:
Mummy is 5|3 for 4

+ 1 card
Giant Frog is 5|3 for 2

+ 1 card + 1 upgrade
3 Giant Frogs is 6

+ 3 cards + 3 upgrades
=> 10

+ 3 cards + 1 upgrade
1 turn global Wisdom is probably valued at around 1-2

, as is 1 card's worth of additional efficiency.
=>
14
+ 1 card + 1 upgradeThoughts? (The cost probably hovers around 14-15

nonetheless)