My favorite color in magic is probably... sideways. It pretty much doesn't really matter to me, as long as pain connects with my opponent's face. Frequently. I guess my favorite sideways color is blue, 'cause it's usually not the go-to color for smashing. Next up would be colorless, since robots do a really good job of smashing, too. After that... green? Well, green and something else, but green is usually a requirement.
I'm also rather fond of stupid combos, especially the ones that take forever (elf combo, [mtg_card=Time Sieve] combo...), and the ones that win on turn one (Oops! All Spells is a really dumb deck). Sometimes I like control, but only if it includes a reasonable degree of stomping (Bant Flash last standard) or comboing (if you want your friends to hate you forever, ask me about Cascabalance/Cascaderate/cascade into Counterbalance.dec).
I've been playing this game for a little while--off and on since Onslaught block (I guess Starter set, if you want to be specific, but are we counting the silly Starter set?), and varying degrees of competitive since somewhere around Lorwyn.