You could just use this as a sac outlet that nets Treasures, but my mind goes immediately to Gravecrawler and any third combo piece you can think of
Creature Artifact - Human Artificer Emry, Lurker of the Loch Affinity for artifacts (This spell costs less to cast for each artifact you control.) When Emry enters, mill four cards
Colossal Majesty At the beginning of your upkeep, if you control a creature with power 4 or greater, draw a card Enchantresss Presence Whenever you cast an enchantment spell, draw a card Kenriths Transformation Enchant creature When Kenriths Transformation enters the battlefield, draw a card Enchanted creature loses all abilities and is a green Elk creature with base power and toughness 3/3 Snake Umbra Enchant creature Enchanted creature gets +1/+1 and has Whenever this creature deals damage to an opponent, you may draw a card Totem armor The Best Green Card Draw Abilities on Creatures Another good source of green card draw comes from abilities on creatures
Way back the powers that be created real life oversized cards that represented what character in the Weatherlight Saga you would be playing
Fairly cheap and legal in most formats, Courtyard will pull its weight in any deck that can meet its typal requirements
Already, this is something a lot of decks will be interested in playing in Commander