A mono-black rat tribal deck that utilizes Ninjutsu, card discarding, and poison.
I use two or three Wing Crafter's to get the Ninjutsu cards through defence once in play or to get some of the rats through the opponents defences. Who works similarly as other flying 1/1 creatures except you can make not only it flying but also another creature of yours flying too (at any time they it or the other creatures enter the battlefield), to get passed defenses without even having to use rely on using Ninjutsu every time via hordes of creatures. Get the damage to player affects going without having to rely solely on ground creatures overwhelming your opponent. Get the stronger creatures to fly too as a added bonus late game.
For added deathtouch and menace to make it harder to block your creatures (and riskier for the opponent) I would add four Nezumi Bladeblesser, 2 Nezumi Prowler and 2 Ogre Slumlords, creature with fear like 3 Nezumi Cutthroat, and more ninja's like Okiba-Gang Shinobi. A few Dirge of Dread works well also, since it makes all your creatures have fear until end of turn. I usually just put 1 Nezumi Cutthroat to get through the opponents defenses every time, and any of plentiful Ninjutsu cards to cause some mayhem.
The Silver-Fur Master gives all ninja's and rogue's a +1/+1 for the following included cards in this deck like Ink-Eyes, Servant of Oni, Mukotai Ambusher, Nezumi Prowler, Okiba-Gang Shinobi, Nezumi Informant and Ogre Slumlord for a total of 14 ninjas and rogues. Theres four Silver-Fur Masters so this stacks the effect for all these great creatures, which also affects the other Silver-Fur Masters.
To ensure that my deck has powerful flying creatures in it I also add a 4 x Guul Draz Specter, which is a 2/2 flying, nothing special except when the player has a empty hand, he then becomes a 5/5 flying creature. And he also makes the opponent discard a card every time he deals damage to the opponent also. 2 Disrupting Scepter, and 4 Psychic Whorl , just to make sure the opponent has a empty hand as soon as possible. Okiba-Gang Shinobi contributes to keeping the opponents hand empty and so then my flying Specters and Ink-Eyes converted enemies from his or her graveyard (from all the discards) can quickly annihilate my opponent.
Bandit's Talent wears the opponent down for having one or less cards during the beginning of the upkeep phase, if I level it up with one black mana. Nezumi Shortfang
also does one, two, or three damage to opponents for each card below three in their hand.
If the ninja's don't do the trick then Karumonix, the Rat King, finishes the job after 10 poison counters.