Planeswalker, Instant, Dragon..
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megamorph 5gg (you may cast this card face down as a 2/2 creature for 3. turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)
when herdchaser dragon is turned face up, put a +1/+1 counter on each other dragon creature you control.
Dragons of Tarkir