Legacy is a format with near limitless possibilities. The interaction is so efficient and the value engines are so varied that you can find all kinds of crazy ways to help your cards line up effectively against opposing ones. With so many strategies in Legacy becoming increasingly streamlined and linear, it's not especially surprising that there are some exciting fringe strategies that can take advantage of it:

White-Blue Rebels - Legacy | CoolUser, 5-0 Legacy League

• Creatures (14)
• 1 Aven Riftwatcher
• 1 Defiant Falcon
• 1 Ramosian Lieutenant
• 1 Whipcorder
• 2 Amrou Scout
• 2 Lin Sivvi, Defiant Hero
• 2 Mirror Entity
• 4 Ramosian Sergeant

• Instants (16)
• 1 Flusterstorm
• 1 Path to Exile
• 2 Spell Pierce
• 4 Brainstorm
• 4 Force of Will
• 4 Swords to Plowshares

• Sorceries (4)
• 4 Ponder

• Enchantments (5)
• 1 Bound in Silence
• 4 Training Grounds

• Artifacts (1)
• 1 Chrome Mox

• Lands (20)
• 2 Plains
• 3 Island
• 1 Cavern of Souls
• 1 Karakas
• 1 Kor Haven
• 3 Misty Rainforest
• 3 Polluted Delta
• 3 Tundra
• 3 Windswept Heath

• Sideboard (15)
• 1 Bound in Silence
• 1 Children of Korlis
• 1 Council's Judgment
• 1 Disenchant
• 2 Faerie Macabre
• 2 Flusterstorm
• 1 Hydroblast
• 2 Meddling Mage
• 1 Pithing Needle
• 2 Relic of Progenitus
• 1 Thousand-Year Elixir

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What's really interesting is the selection of rebels in this deck. Ramosian Sergeant is the most important rebel, as it is the cheapest, and can sneak in under counterspells. You have a plethora of two-drop rebels to go up the chain, including Amrou Scout, Ramosian Lieutenant, and Defiant Falcon depending on what you need. Topping out your Rebel curve is Lin Sivvi, Defiant Hero. Lin-Sivvi is key to this deck because she allows you to recycle key rebels once your opponents have dealt with them for the first time. You can even loop your Lin Sivvis, as long as your opponent is relying on Fatal Push instead of Swords to Plowshares.

You've also got a couple of very interesting tutor targets for very specific situations. Bound in Silence and Whipcorder are great against cards like Emrakul, the Aeons Torn and Marit Lage. Aven Riftwatcher does a great job of helping you race and generally keeping your life total out of the red zone. Mirror Entity is a terrifying win condition that can come out of nowhere and plays well with Training Grounds. You could even go further and play cards like Nightwind Glider if you expect to see mostly Black removal and a lot of Gurmag Anglers.

All in all, this is a really interesting take on tempo in this format. You have all manner of interesting tutor targets, and can easily leave up your mana to threaten interaction and develop your board only if your opponent doesn't commit anything. Training Grounds is a great way to cheat on mana and get a bunch of rebels into play quickly. Once you've gotten one or two Rebel activations, you're just an end-of-turn Mirror Entity away from killing your opponent.