Well I decided to post my sliver life gain combo.
Essence Sliver + Magma Sliver + 5 or more slivers = a lot of life, especially if you have the sliver that gives other slivers provoke.
Just so no one has to look up any cards
Essence Sliver: Whenever a sliver deals damage, it's controller gains that much life.
Magma Sliver: All slivers have "tap, target sliver gets +X/+0 until the end of turn, where Xis the number of slivers in play."
So you have about five slivers out, you attack with a 2/2, the person blocks, or doesn't whatever they choose, then you tap the four slivers that aren't attacking a viola! that's 22 life! 47 if you have ten slivers out! I had a lot of slivers and I gained a lot of life lol, I love slivers.