Also I good strategy is to NEVER buy N-wilds. Buy N-gatcha instead. Why? Random Level up on R and SR cards. plus when you reach level 100 on all your N cards you can get N-wild as compensation and still occasionally hit an R card or SR for a small boost. If you gat a N-sec (special event card) and do not have all your N cards at 100+ then by all means buy N-wild to top off the sec card. that way you get full use of your pero.