Activated abilities dont trigger effects like magecraft, and their costs arent reduced by cards like The Immortal Sun
Blazing Shoal makes a lethal combo with Vivi Ornitier, pumping up Vivi's power without any mana investment, in turn letting the little wizard generate a heap of free mana via its activated ability
Notable examples include Mega Charizard EX, Mega Gengar EX, and Mega Rayquaza EX
Tidus, Zanarkand Fayth (Thrasios, Triton Hero) You'd be hard-pressed to see Thrasios played anywhere other than low-powered Merfolk Commander decks, but the Final Fantasy X cover art is the big selling point here
Honest Rutstein synergies with Karador, Ghost Chieftain and Sidisi, Brood Tyrant by making them cheaper to cast and bringing back the best creature milled by Sidisi, Brood Tyrant or destroyed by an opponent
Building a strong deck in Pokemon TCG Pocket isnt the easiest feat, with most meta decks requiring duplicates of rare ex Pokemon that you cant guarantee youll own or open in the next booster pack