G/R/B sideboard heip

[An Angry Fatman]

{vexing devil} x4
{birds of paradise} x4
{stromkirk noble} x4
{stromkirk captain} x4
{Falkenrath aristocrat} x3
{Olivia voldaren} x3

{tragic slip} x4
{pillar of flames} x4
{rancor} x4
{dangerous wager} x4

{swamp} x5
{forest} x5
{mountain} x5
{evolving wilds} x3
{dragonskull summit} x4

Need help on making a sideboard
So far I got
{naturalize} x3
{gnaw to the bone} x2

[An Angry Fatman]

Any suggestions are awesome
Need help for delver decks that is my major downfall

[Thorn]

4x {Rolling Temblor}
4x of that spider that deals X damage to each creature with flying.

[An Angry Fatman]

What's the cost for the spider and a name would be awesome. I'm trying to keep my average cost under 2 or so.

[Ghebert]

4x {Rolling Temblor}
4x of that spider that deals X damage to each creature with flying.

{Silklash Spider}

[An Angry Fatman]

Thanks for those suggestions but they are wayy to high cost. My average mana cost is below two so I would like to keep it there. So suggestions for either a one or two drop are most appreciated. I will take a look at three drops though