Sideboard Plan
Delver
Out -3 Harrow -2 Crop Rotation -1 Grim Harvest -1 Tilling Treefolk
In +4 Pyroblast + 1 Ravens Crime +2 Terminate
You already have a good amount of removal, you just want to kill your way to the midgame and start to grind out value. Use Raven Crime to wear away their hand.
Affinity
Out -3 Harrow -1 Ravens Crime -1 Flame Jab, -2 Crop Rotation -2 Swirling Sandstone
In +3 Ancient Grudge +4 Pyroblast +2 Terminate
Kill with Grudges, and Counter card draw with the pyroblasts. Don't let them refill their hand.
Hexproof
Out
-3 Harrow -1 Flame Jab
In
+2 Swirling Sandstorm +2 Serene Heart
Burn to the face, Keep the board as clear as you can, and Use the Heart to create bad blocks for them.
MBC
Out
-3 Harrow -2 Crop Rotation -1 Flame Jab
In
+2 Swirling Sandstorm +1 Raven's Crime
+1 Grim Harvest +2 Terminate
Keep the board clear so Gary is less of a problem. Use Crime to keep their hand empty, and the extra Grim Harvest to keep your creatures coming back for more.
Tron
Out
-3 Harrow, -1 Flame Jab, -2 Swirling Sandstorm -2 Crop Rotation - 1 Tilling Treefolk
In
+3 Ancient Grudge + 4 Pyroblast +2 Terminate
Kill mana rocks, and never let them resolve a Mulldrifter.
Slivers
Out
-3 Harrow -1 Flame Jab
In
+2 Swirling Sandstorm +2 Terminate
Keep the board clear. Sandstorm is the anti aggro plan.
Deliver Fiend
Out
-3 Harrow -1 Flame Jab -2 Swirling Sandstorm -2 Crop Rotation
In
+ 1 Raven's Crime +4 Pyroblast +2 Terminate
They play few creatures, you have much removal, punish their hands, and kill and counter there creatures.
Goblins/Stompy/White Weenie
Out
-3 Harrow -1 Raven's Crime
In
+2 Swirling Sandstorm +2 Terminate
Weather the early beats, and sweep the board. Win the long grindy game. Same board for all 3 decks.
Boros Kitty
Out
-3 Harrow -2 Crop Rotation
In
+2 Terminate, +3 Ancient Grudge
Grind Vs Grind. Keep them off of artifact lands as much as you can with the grudges, and Terminates give extra removal.
Azorious Kitty
Out
-3 Harrow -2 Swirling Sandstorm -1 Flame Jab -1 Crop Rotation
In
+4 Pyroblast, +1 Grim Harvest, +2 Terminate
Burn
Out
-2 Swirling Sandstorm
In
+1 Raven's Crime, +1 Grim Harvest
You want to start to work on their hand as soon as you can, and then start burning face as fast as you can. No lifegain for us here.
MUC
Out
-2 Swirling Sandstorm -3 Harrow -1 Flame Jab, -1 Tilling Treefolk
In
+4 Pyroblast, +3 Ancient Grudge
Extra protection for your spells, and kill for there mana rocks, Try to cast as many spells on their turn as you can. You have uncounterable card draw, and burn so you have a slight edge.
Tortured Existense
No Board, you are running Bog in your main deck, and you can search it up at will, use it at the best time and you can totally get them.