Until the end of you turn, the ATK of all face-up monsters on your field increases by the number of monsters on your field times 100. This skill can only be used once per turn.
So I just figured this out. I had 2 monsters on the field, I summoned Winged Minion, activated the skill so each monster got 300 attack, then activated Winged Minion's effect of adding 700 attack to any Fiend type monster I have. The 300 I gained from this skill did not go down to 2 after Winged Minion left the field, so if the number of monsters on your side of the field will decrease before battle for some reason (like with my test) be sure to activate this skill BEFORE those monsters leave your side of the field. Union decks seem to good examples of this
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