Today's CotD is Fan Rotom from RR. Statwise, 70 HP is nice for a Basic, +20 Weakness to :dark: is ok since :dark: Pokemon aren't common, -20 Resistance to :colorless is nice (Flygon fails), and no Retreat Cost is great. Fan Shift is a nice Poke-Power, letting you turn Fan Rotom from a :lightning into a :colorless type for your turn; in particular, this makes him a great tech against decks like Flygon. Spin Storm is decent for :colorless:colorless, giving you a 50/50 chance of "blowing" the Defending Pokemon back into your opponent's hand (very nice if you can get rid of a big threat). Air Slash is a bit expensive at :colorless:colorless:colorless for 60 and a chance to discard an Energy off Fan Rotom, but with a Lucario GL or Lake Boundary in play, this attack will OHKO Flygon, which is a very nice bonus. For the Lv X though, you'd need to come up with another 20 damage somehow, which isn't too hard.
Modified - 8/10 (One of the better Rotom forms at the moment, if only for its fun techability against the overrated Flygon. Would be lower otherwise if Flygon wasn't as abundant)
Limited - 8/10 (Good here as well since you can be super effective against 2 different Weaknesses)
Unlimited - 1/10 (No use here, as many cards are)