Fhenvuld, the Cryptic

Flying, Hexproof
•Whenever a Fhenvuld or another Dragon enters
the battlefield under your control, turn target permanent face up or down.
•Whenever a Dragon you control attacks, turn
target permanent you control face up or
face down.
•At the beginning of your end step, put a +1/+1 counters on each of up to two target creatures
Of the many mysteries of Tarkir, the lingering influence of Fhenvuld is among the most baffling.