Flying Ninjas. No real description needed here. Play unblockable guys, then ninjutsu as often as you can.
Thalakos Seer
is your hoped-for ninjutsu fodder as lifting him will net you a card. The Seer into Okiba-Gang is sweet. After that your ninjas should be flying thanks to Wingcrafter, what a cute little fellow. Protect your guys with counters and Undying Evil. The Mulldrifter/Undying Evil 4-card bonanza is always fun.
Affinity: +2 Mistblade Shinobi, +2 Doom Blade, -2 Chainer's Edict, -1 Undying Evil, -1 Ponder
Angler Delver: +2 Mistblade Shinobi, +3 Skullsnatcher, +2 Dispel (if lots of instant removal), -4 Rune Snag, -1 Undying Evil, -1 Wingcrafter, -1 Stealer of Secrets
Azorius Kitty: +2 Doom Blade, -2 Undying Evil
Azorius Control: +2 Dispel, -2 Undying Evil
BorosKitty: +2 Dispel, +2 Echoing Decay (if goblin tokens), -1 Undying Evil, -2 Chainer's Edict, -1 Ponder if needed
Burn: +2 Dispel, +1 Font of Return, -2 Chainer's Edict, -2 Tragic Slip (keep 2 Edicts for Keldon Marauders). If no creatures take out all your removal and add +2 Counterspell
Delver: +2 Dispel, +2 Echoing Decay, +2 Mistblade Shinobi, +2 Doom Blade, -4 Chainer's Edict, -1 Undying Evil (or -2 if no Quicksand or Piracy Charm), -1 Stealer of Secrets, -1 Ponder, -1 Bojuka Bog
DelverFiend: +2 Dispel, +2 Mistblade Shinobi, +2 Echoing Decay, +2 Doom Blade, -4 Rune Snag, -2 Undying Evil, -2 Stealer of Secrets
Dimir Mill or Teachings: (see Mill deck or Teachings below).
Elves: +2 Echoing Decay, +2 Doom Blade, +2 Mistblade Shinobi, -2 Stealer of Secrets, -2 Undying Evil, -2 Chainer's Edict
Goblins: +2 Echoing Decay, +2 Doom Blade, +2 Mistblade Shinobi, -2 Stealer of Secrets, -4 Chainer's Edict
Hexproof: +2 Counterspell, -2 Tragic Slip
Illusory Tricks: +2 Mistblade Shinobi, +2 Doom Blade, -2 Chainer's Edict, -1 Undying Evil, -1 Stealer of Secrets
Infect: +2 Echoing Decay, +2 Doom Blade, +2 Dispel, +2 Mistblade Shinobi, -2 Undying Evil, -2 Stealer of Secrets, -1 Bojuka Bog, -1 Okiba-Gang, -1 Mulldrifter, -1 Bonesplitter
Izzet Control: ? Not sure but +2 Dispel if mostly instants, +1 Font of Return if lots of burn, +3 Skullsnatcher if they are using graveyard. Take out Chainer's Edict and Tragic Slip, replace with Doom Blade
MBC: +2 Echoing Decay, -2 Chainer's Edict or -4 and +2 Dispel if lots of instant removal
Mill deck (Jaces Erasure/Fog): +2 Counterspell, +2 Dispel, +1 Font of Return, +3 Skullsnatcher, -2 Undying Evil, -4 Edict, -2 Slip
MUC/Faeries: +2 Echoing Decay, +2 Doom Blade, +1 Mistblade Shinobi, +2 Dispel, -2 Undying Evil, -1 Bojuka Bog, -2 Edict, -2 Stealer of Secrets
Rakdos Aggro/Removal: +2 Dispel, +1 Font of Return, +2 Mistblade Shinobi if a lot of annoying creatures, -4 Rune Snag
Stompy: +2 Echoing Decay, +2 Doom Blade, +2 Mistblade Shinobi, -4 Rune Snag, -2 Stealer of Secrets
Teachings: +2 Counterspell, +2 Dispel, +1 Font of Return, +3 Skullsnatcher, +1 Nihil Spellbomb, -4 Rune Snag, -2 Tragic Slip, -2 Chainer's Edict
Tortured Existence: +2 Mistblade Shinobi, +1 Nihil Spellbomb, +3 Skullsnatcher, -2 Tragic Slip, -4 Chainer's Edict OR -4 Rune Snag, I really don't know which is better, I think keep the counters in for Tortured Existence and/or Journey to Nowhere?
Tron: +2 Doom Blade, +2 Mistblade Shinobi, +2 Counterspell, -4 Rune Snag, -1 Undying Evil (-3 Undying Evil if mono-blue tron), -1 Stealer of Secrets
White Weenie: +2 Echoing Decay, +2 Mistblade Shinobi, +2 Doom Blade, -2 Undying Evil, -2 Edict, -2 Stealer of Secrets