I cannot spell it out any clearer than this:
If the cards cost is 9
or higher the cost could be reduced by 3 (this applies to the nymph and dragon, basically).
If the card cost is between 4 and 7
, the cost could be reduced by 2 (this applies to thorns, jade shield and bond).
If the card cost is under 4
, the cost could be reduced by 1 (all remaining cards other than pillars/towers/pendulums).
I even put the creatures in the parenthesis so it would be like having every single possible example.
here are a few painfully detailed and spelled out:
*you play a gecko, next you play an other gecko, theres a 75% chance it will only cost 1
instead of 2
*you play a gecko, next you play an unupped dragon, theres a 75% chance it will only cost 7
instead of 10
*you play a gecko, next you play an upped dragon, theres a 75% chance it will only cost 9
instead of 12
*you play a gecko, next you play a frog (both frogs are 2:life), theres a 75% chance it will only cost 1
instead of 2
*you play a gecko, next you play a rustler (both are 1:life), theres a 75% chance it will only cost 0
instead of 1
*you play a gecko, next you play a cockatrice (both are 3:life), theres a 75% chance it will only cost 2
instead of 3
*you play a gecko, next you play a forest spirit, theres a 75% chance it will only cost 1
instead of 2
*you play a gecko, next you play a forest spectre, theres a 75% chance it will only cost 2
instead of 3
*you play a gecko, next you play a heal, theres a 75% chance it will only cost 2
instead of 3
*you play a gecko, next you play an improved heal, theres a 75% chance it will only cost 1
instead of 2
*you play a gecko, next you play a thorn carapace (both are 7), theres a 75% chance it will only cost 5
instead of 7
*you play a gecko, next you play an emerald shield, theres a 75% chance it will only cost 3
instead of 5
*you play a gecko, next you play a jade shield, theres a 75% chance it will only cost 5
instead of 7
*you play a gecko, next you play an emphatic bond, theres a 75% chance it will only cost 4
instead of 6
*you play a gecko, next you play a feral bond, theres a 75% chance it will only cost 3
instead of 5
if anyone is still confused, thats a personal problem, not a problem with this card.