The fifth major expansion and first expansion of the B series packs introduces Mega Evolved Pokmon to the game, based on their appearance in the Mega Evolution TCG series
However, previous to Cloud and Tifa, there were only three cards in Magic: The Gathering that used seven as a power threshold for abilities
From Mana Rocks such as Gilded Lotus and Thran Dynamo to card flow like Mind's Eye or Skullclamp to win cons like Blightsteel Colossus and others, all you have to do is have three differently named artifact tokens, like the ones made or Treasure, the 1/1 colorless artifact Gnomes in this set, Powerstones, Junk, Gold, Constructs, the above card, loads more
Then the two-drop 1/3 Tinybones, Bauble Burglar has a trigger when a foe discards to exile it with a counter and then you can play them on our turn and we can use any of our mana on it, then we can tap it at sorcery speed with four to force everyone else to discard too
Speaking of challenges, Mauis Cheeeehoooo