Just for your information, an EX is a different card name than a non-EX, so you may run 4 charizards and 4 charizard EX if you wanted
C Common Canon the Melodious Diva X LIGHT Level 4 [ FairyEffect ] ATK 1400 DEF 2000 If you control a "Melodious" monster, you can Special Summon this card (from your hand)
If your current hand is a bit dead, and you exchange it with the top of your library, and it also ends up a bit flat, then youre kinda stuck for the foreseeable future
The game has a sort of Hearthstone-style resource system where, unlike Magic, Pokemon, and similar TCGs, the resources you use to play your cards naturally accumulate as turns go by
Pairing that up with Double Trouble is like a bowling trick-shot but remember it cant choose the same character twice for the damage