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Describe the Bug:
Works correctly when there is 1 zombie in your gy, but when there are 2 it cancels the spell and returns to hand when you select the 1st zombie.

Which card did behave improperly ?
Ghoulcaller's Chant

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2014/12/20: Commanding 2014 Urzas,duel

What exactly should be the correct behavior/interaction ?
Should be able to return to hand either 1 creature or 2 zombies.

Are any other cards possibly affected by this bug ?
-

Maybe the main problem is that it doesn't ask which of the 2 options of the spell you want to cast.

Fixed in 8e97715

Ok, rather messed up.

1) had 3 zombies in gy and no other creatures. When cast returned 1 of the zombies (no chance to return a second), but when I tried on either of the other two it rejected back to hand.

2) had 2 zombies in gy and an Abomination in gy. When I tried to cast it I got an error message of couldn't add another type, a Rusted Relic (with 2 other artifacts in play) lost its metalcraft ability, and the spell was rejected back to my hand.

3) with 1 non-zombie in gy spell was rejected back to hand.

Probably all fixed by this.