Scurry of Squirrels has double myriad, so any time you attack with it there are suddenly going to be tons of 2/2 squirrel tokens on the board, and they are likely to grow your creatures because it isnt like your opponent can account for all of them
Older cards don't have a set code so, you need to know the symbol for each set to be able to tell on-sight, but a quick search over on Gatherer can help you out when youre not sure
You either love him or hate him: Its Edgar Markov
By the time this card runs out of nodes, you should have all the colors you need
Sure, there are players who don't own any cards (or don't care about the few cards they do happen to own), prefers to proxy up the decks they play, and couldn't care less about the flavor, editions or conditions of cards they use
In fact, all you have to do is play it, and you can then tap it for two Colorless mana every turn