For example, say a player casts Croaking Counterpart (a sorcery that says "Create a token that's a copy of target non-Frog creature, except it's a 1/1 green Frog.") targeting Goblin Glasswright
My actually-competitive deck is this concept in the extreme: the Moltres EX and Charizard EX combo that requires gathering energy with one, and gradually sticking it on the other, until the latter is fully charged and ready to do more guaranteed damage than any other card in the game
It heavily relies on getting out the powerful Coalossal VMAX card into play, a new type of evolution that builds on the powerful Coalossal V
Jareth, Leonine Titan makes a great one-man-army, effortlessly trading with enemy creatures and forcing your opponents to consider the chance of lethal commander damage
So, seeing these boosters included in an upcoming ex Premium Collection is pretty exciting news
ex cards play a central role, offering power and flexibility, but requiring real thought about how to use them in a game