Ok guys and gals, I want to know everyone's opinion on my Modern Elves deck. It can win and hit its infinite combo on turn 4 and does fairly regularly. Infinite combo is archdruid and umbral mantle and having 4 elves total out. obviously you can tap archdruid for 4 mana and then use umbral mantle and 3 mana to untap and give +2+2 until end of turn. My main concern is what am I looking at for a sideboard against current top 8 decks. I would lov3e to try this at a big tournament, but don't feel comfortable going without a good sideboard.

When your infinite combo hits also if one of the elves out is one of your creature producers, you now have infinite creatures.