at first, but once you get building you can get some intense synergy out of 3-4 colors but you want to make sure most cards are of one or two core colors. RTR was built for 2-4 color combos, i will be sad when it phases out, the hybrid and double cards are amazing.the more colors you add the more calculations you are going to have to do on the probability of getting specific cards and planning synergy of the cards. there is much less space for error the more colors you use but the power you can unleash is sometimes really worth it.
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its actually only red and blackit has some hybrid cards
looks good if you can get the right cards out fast enough, but with such a high mana curve can it hold up to an agro 3 turn burn or growth deck.
doomblade would be a good replacement though.
stab wound is a great card, its no doomblade but its brutal none the less
that's a good question. i'll have to find one to put it up against.
due to mana cost. banishing requires on one specific color and 2 colorless. putrefy requires a green and a black and a colorless, and murder requires 2 black and a colorless.