Good rare options include the power 9, cards from the reserved list (proxied, of course), or cards that are banned in certain formats
Enchantress decks can make really good use of this green creature, especially if youre running a bunch of enchantment creatures
I wouldnt suggest throwing your bulk in here but a safe this size could easily fit more than 12 of the standard card boxes inside
4 years ago I think you should cut: Brutalizer Exarch, Conduit of Ruin, Frost Titan, Giant Adephage, Myr Battlesphere, Oblivion Sower, Pelakka Wurm, Phyrexian Ingester, Rashmi, Eternities Crafter, Rattleclaw Mystic, Sagu Mauler, Simic Sky Swallower, Sphinx Ambassador, Stalking Vengeance, Tornado Elemental, Plasm Capture, Pandemonium, Sunken Hope, Tezzeret the Seeker, Chromatic Lantern, Darksteel Ingot, Disaster Radius, Explosive Vegetation, Heat Shimmer, Rude Awakening, and Spelltwine