Grixis Twin list and sideboard guide is credited to Sxnr1se on MtgSalvation.
Sideboard guide.
Jund:
-3 Twin, -2 Pestermite, -1 Exarch, -1 Dispel, +1 Negate, +1 Jace, +2 Keranos, +1 Olivia, +1 Spellskite
Burn: -
1 Twin, -4 Remand, -1 Cryptic, -1 Serum, +2 Skite, +2 Dispel, +1 Negate, +1 Anger, +1 Explosives
Affinity:
-4 Remand, -2 Tasigur, -1 Dispel, -1 Snare, +2 Anger, +1 Vandalblast, +1 Lavamancer, +1 Olivia, +2 Skite, +1 Explosives
RG Tron:
-2 Snare, -1/2 Terminate, -1/2 Bolt, +1 Dispel, +1 Skite, +1 Vandalblast, +1 Clique, +1 Negate
Grixis Control:
-3 Twin, -2 Pestermite, -2 Exarch, -1 Bolt, +2 Dispel, +1 Negate, +1 Skite, +1 Jace, +2 Keranos, +1 Clique
UR Twin:
-2 Twin, -2 Pestermites, -1 Serum, -2 Bolt, +1 Jace, +2 Skite, +2 Dispel, +1 Negate, +1 Clique
Grixis Twin:
-2 Twin, -2 Pestermites, -3 Bolt, +1 Jace, +2 Skite, +2 Dispel, +1 Negate, +1 Clique
Abzan:
-3 Twin, -4 Exarch, -1 Bolt, +1 Skite, +1 Clique, +1 Explosives, +2 Keranos, +1 Jace, +1 Negate, +1 Anger
Infect:
-1 Twin, -4 Remand, -1 Cryptic, -1 Serum, -1 Snare, -1 Tasigur, +1 Lavamancer, +2 Skite, +2 Dispel, +1 Negate, +1 Olivia, +1 Explosives, +1 Anger
Bogles:
-4 Remand, -2 Bolt, -2 Terminate, +1 Explosives, +2 Anger, +2 Skite, +1 Negate, +1 Dispel, +1 Clique
UW/UWR:
-3 Twin, -2 Pestermite, -1 Exarch, -2 Bolt, +1 Negate, +2 Dispel, +2 Keranos, +1 Jace, +1 Skite, +1 Clique.
Grixis Delver:
-3 Twin, -2 Pestermite, -2 Exarch, +2 Dispel, +1 Negate, +1 Skite, +1 Jace, +1 Keranos, +1 Clique
Abzan Company:
-2 Twin, -2 Exarch, -4 Remand, +2 Dispel, +1 Keranos, +1 Jace, +1 Olivia, +2 Anger, +1 Explosives
Naya Company:
-1 Twin, -2 Pestermite, -4 Remand, -1 Snare, -2 Dispel, +1 Keranos, +1 Jace, +1 Olivia, +2 Anger, +1 Explosives
Merfolk:
-1 Twin, -4 Remand, -1 Tasigur, -1 Snare, +1 Keranos, +1 Lavamancer, +1 Negate, +1 Explosives, +2 Anger, +1 Vandalblast
Elves:
-4 Remand, -1 Twin, -1 Snare, +1 Olivia, +2 Anger, +2 Dispel, +1 Explosives.
Zoo:
-2 Twin, -2 Pestermite, -4 Remand, -1 Kommand, +2 Skite, +2 Keranos, +1 Explosives, +2 Anger, +2 Dispel
Amulet Bloom:
-2 Bolt, -1 Serum, -1 Snare, -1 Remand, +1 Dispel, +1 Negate, +1 Vandalblast, +1 Skite, +1 Clique. Not sure about Remands, tho.
RUG Twin:
-2 Twin, -2 Pestermite, -2 Bolt, +1 Keranos, +1 Jace, +1 Skite, +1 Negate, +2 Dispel.
Ad Nauseam:
-2 Terminate, -2 Snare, -2 Bolt, +2 Dispel, +1 Negate, +1 Explosives, +1 Vandalblast, +1 Clique
Griselcannon:
-4 Bolt, +1 Negate, +2 Dispel, +1 Clique
Scapeshift: -3 Bolt, -2 Terminate, +1 Negate, +2 Dispel, +1 Jace, +1 Clique
Martyr Life:
-4 Remand, -1 Twin, -1 Exarch, -2 Tasigur, -1 Serum, +2 Keranos, +1 Jace, +1 Lavamancer, +1 Olivia, +1 Explosives, +2 Anger, +1 Negate
Living End:
-4 Bolt, +1 Negate, +1 Clique, +2 Dispel
U Tron:
-4 Bolt, -1 Twin, -1 Exarch, +2 Dispel, +1 Negate, +1 Clique, +1 Jace, +1 Vandalblast.
UB Tokens:
-4 Remand, -2 Twin, -1 Exarch, -1 Tasigur, -1 Serum, +2 Keranos, +1 Lavamancer, +1 Negate, +1 Jace, +1 Olivia, +2 Anger, +1 Explosives.
