greater gargadon can't cast
when greater gargadon is suspended,gargadon can reduce time counter by sacrifice.And normally,time counter get 0,gargadon can cast.
but actually,gargadon can't cast.The window for cast don't appeared.I think its bug.
It just happened to me, I believe it happens if you try to do it anytime outside of the upkeep trigger.
So sad to find this bug after buying all the pieces to Restore Balance this morning.