Marvel Legends Brotherhood of Evil Mutants II

• Mystique
• Destiny
• Pyro
• Avalanche
• Blob
• Rogue

You don't really need Rogue to finish the set, but she's sold with Destiny so there's no reason to leave her out. You could also get Spiral and possibly SuperPatriot (IYKYK) and you'd almost have a complete Freedom Force team instead.