is the way to go,,its hard to deal with a sliver
deck that has out a sliver legion
making them all gigantic and then throwing in shifting making them all unblockable,,, also its always good to use an amboid changling or however its spelled with the overlords, that way you can gain controll of other players creatures on top off having a 7/7,, and i messaged wizard,, when you change a creatures type with the changling then gain controll of it with the overlord,, you keep the creature from then on,,also,, there's thats one black sliver
that has all slivers have sacrifice
this permanent destroy target permanent,, cant remember what its called,, but it's always a good 1 to have in a sliver
deck,, sac all the weeker ability slivers to destroy their permanents,, it's good,,,, then theirs pollmonic sliver
, or something like that,,, i think it costs 5 to bring out,, but gives all your slivers flying and they all get when this sliver
dies you may put it on the top of your library,, run it and the necrotic i think its called and you can keep sacing creatures to destroy permanets then puting the saced creatures on top of your library,, draw them again , do it again. works pretty nicely,,, hope that helps ya out some.