They are activated when an Option card with such an effect is played, or when a Digimon or Tamer has such an effect, and you choose to trigger the effect anytime during the Main Phase
Balancing something so fundamental as manabases is incredibly tricky
The RICOH fi-8250 scanner is the perfect choice for collectors of YuGiOh and other valuable trading cards
And Mega Sceptile-EX turns out to be really awesome, because it's a really inexpensive energy acceleration attack for Grass type, which is a type that's lacking in good energy acceleration
Naturia Dragonfly X EARTH Level 4 [ Insect / Effect ] ATK 1200 DEF 400 Cannot be destroyed by battle with a monster that has 2000 or more ATK
If you pick the Charizard pack, you get Charmanders Full Art, and if you open the Mewtwos or Pikachus packs, you get Bulbasaurs and Squirtles variants, respectively