The sliver decks gained some great peasant magic cards from
TimeSpiral block. Homing Sliver is a great all-purpose
sliver tutor which can also be a creature.
Bonesplitter and Might Sliver pump up the slivers by two
power. Two-headed sliver provides a form of evasion (or
makes their blocks hurt more). Firewake adds more haste.
Virulent adds poison, which can mean some really broken
games in multiples when your opponent is gold-fishing early
on. Spinneret is a sliver bear, which is better than average
for a sliver as far as P/T goes. Once Gemhide hits the field
with a Haste Sliver in play you can dump the rest of your
hand quite easily (basically 2CC slivers cost 1 since you
can tap them for mana the turn they come into play). Against
a goldfish player you can go first turn Virulent, second
turn Heart (swing with both), third turn Gemhide into Muscle
and swing with Virulent, Heart, and Muscle. Or you can just
ride the curve and then gain tempo with Bonesplitter.