I really want to make a slivers deck, but 3 and 4 color decks aren't my thing. Would a {red}/{white} one be competitive?
In standard or legacy?
Standard
Well, the slivers for 2 you'll have are:
{Striking Sliver}
{Battle Sliver}
{Thorncaster Sliver}
{Blur Sliver}
{Sentinel Sliver}
{Steelform Sliver}
{Hive Stirrings}
{Bonescythe Sliver}
If you ran a playset of each plus 6-7 removal, it could work
Gruul slivers is a better shot due to the buffs and manaweft though they do have less removal
Naya is by far the best one, because most slivers are RG and a few awesome ones in W, plus {Hive Stirrings}. But Boros, it could work but not be as good as Gruul or Naya.