Collectible Card Game Headquarters

Describe the Bug:
Gigapede vanishes itself and all cards in your graveyard if you don't have a card to discard at the beginning of your upkeep when it's ability triggers.
It has the same bug Pyre Zombie had:
viewtopic.php?f=110&t=16340&p=168990&hilit=vanish+graveyard#p168957
Which card did behave improperly ?
Gigapede

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2016/01/15: Battle For Zendikar v2,duel

What exactly should be the correct behavior/interaction ?
Gigapede

Are any other cards possibly affected by this bug ?
Other cards that can return from graveyard (possibly exile,too)to hand(possibly to battlefield,too) if their requirements can't be met when their ability triggers.No cards have been tested.

I had it disappear itself, but not other cards.

The catch is it disappears all cards under it in graveyard (cards put there before Gigapede did).

Fixed in 67e1c32