...An anubis?...
Will need tweaking- coz anubis is useless without a quint to stop it dying; you'd probably want two of each for consistancy but then you'd have added 4 cards and might have to take something out to keep the likely-hood of an early hourglass up which would take a bit of uming and aring...
Maybe an upped flying weapon?
If I was making a version for people that could afford a few upgrades then I'd upgrade the hourglasses before the animate weapon because enernity lock only becomes scary when you can pull it off almost every time (eg. more eternities, more Animate weapons)