Instead of merely, making the creature sacrifice itself to counter a spell, we used the same trick we used on Ravenous Baloth and Wall of Mulch
Mega Symphonia (M1S) contains 92 cards in total
Generating Massive Card Advantage With Ancestral Recall, blue decks could easily chain multiple copies per turn in the early game
This has considerable implications as you can now allow the new cards to dictate the path your deck will take, whereas before your colors where already set when you came to Pack 3, and the newest set was merely used to flesh out your deck in its already defined colors and archetype
Mega Evolution cards expanded into the Sun & Moon era, where dozens of valuable cards from sets like Team Up and Unified Minds appeared with two Pokemon, at least one of which was Mega Evolved
However, they can still be quite costly if you plan to purchase the whole deck - we recommend you copy the decklists and substitute for similar or same cost cards where needed