"Sliver Legion" is a 7/7 legendary five-color sliver printed for the Magic the Gathering expansion set known as "Future Sight." It is one of the many sliver creature cards printed for the Time Spiral block. This is a creature that distinctly shows that you could overrun an opponent with sliver creatures. Most experienced players would probably say that the Sliver Legion is one example that playing with slivers takes little to no skills at all. With the right mana fixing and mana acceleration, you can use Sliver Legion to creature an army of juggernauts to use against your opponents.
The converted mana cost for Sliver Legion is five. You are going to need one mana of every color to play Sliver Legion from your hand onto the battlefield. For what the Sliver Legion can do, the converted mana cost is well worth it. Keep in mind that Sliver Legion is a legendary creature and is subject to the "legendary rule." If there are at least two cards on the battlefield named Sliver Legion, they both get sent to the graveyard.
What does Sliver Legion do in the first place?
When Sliver Legion is on the battlefield, all sliver creatures get +1/+1 for each other sliver on the battlefield. Say that Sliver Legion and a 3/3 sliver were on the battlefield, they both would get +1/+1 from each other. Sliver Legion would become an 8/8 creature and the other sliver would become a 4/4 creature. All you would have to do is bring one sliver onto the battlefield after another.
Slivers were a creature dynamic introduced to Magic the Gathering via the Rath cycle which consisted of "Tempest," "Stronghold," and "Exodus." This is a tribe of creatures meant to work together. Whenever one sliver is on the battlefield, other slivers would gain the ability of that same one. One example would be the "Crystalline Sliver." It is a 2/2 sliver with Shroud. When that is on the battlefield, other slivers receive Shroud.
As long as Sliver Legion is on the battlefield, you simply need to bring one sliver onto the battlefield after another. With each new sliver that enters, all slivers including Sliver Legion get stronger. You have plenty of strikers and blockers in this respect.
One good combination would be with the "Sliver Queen" which was introduced in Stronghold. You pay two mana of any color to have Sliver Queen produce 1/1 colorless sliver tokens. Since you do not have to tap the Sliver Queen, you could do this as many times as you want as long as you have the mana. Using this ability is a cheap way to boost up your other slivers.
As a result, Sliver Legion is a must have in any sliver deck. In an EDH (Elder Dragon Highlander) deck format, Sliver Legion does make an excellent general if you plan on building around slivers. It is pretty much the same casting cost as the Sliver Queen. Overall, this is a great card to have if you plan on playing with slivers. Keep in mind, an opponent will try to pop it off first chance s/he gets.