Dragonlord Placidusax

flying, trample
when Placidusax enters the battlefield pay {x}. choose up to {x} other dragons you control.
exile them until Placidusax leaves the battlefield
Placidusax has all abilities of all cards exiled with it
{w}{b}{r}{g}: exile Placidusax, return it to the battlefield at the beginning of the next upkeep