Do you have any particularly odd way you like to play with a large card count, or are you a competitive person looking to cut all corners to get the best advantage
Whether its a sorcery, a creature with an enters-the-battlefield ability, the loyalty ability on a planeswalker, or even just an instant that your opponent is forced to cast main phase because they were tapped out on your turn, there are a multitude of ways your opponent could remove your permanent on their turn for roughly three mana
The difference is very visible next to the Chocobo Bundle
If you want to commit even harder to the wraith typal theme, changelings are a great place to start with Black Market Connections, Changeling Outcast, and Maskwood Nexus
Garruk, Cursed Huntsman, aka basically Elspeth, Suns Champion
This Coldsteel Heart takes things to a ridiculous notch, going for about $20 on average