mystery booster box draft MTG Pack : Booster Convention Edition (MB1) — Twenty Sided Magic: The Gathering Mystery Booster

The chances for each of the 40 cards in their Deck being "Megamorph" is listed as a percentage and a probability out of 2048

Weakness: Fighting (x2) Resistance: none Retreat: 1 #112 Chatot Colorless HP70 Basic Pokemon [C] Cycle Draw: Discard a card from your hand

So the little information I could find is these were only made for the magazine

While it may not be common knowledge to everyone, Mike Romano (@mromano2003) and his whopping 7,000,000 views definitely know

But what it did more than anything else was strengthen the concept of the archetype, cards which would belong to the same theme, supporting one another via monsters, spells, and trap cards to create a deck which had synergy between all of its cards