Characters can challenge each other, though in a neat twist, you can only Challenge characters who are Exerted
That is owing to its colorless holographic background as compared to the typical Fire-type one
Even its second clause is worded in a very forgiving way, allowing for Out of the Tombs to be removed or cards to be shuffled back into the library with no ill effects
So, by keeping a minimum of three Stamina, you can be prepared for when a really enticing offer appears that you dont want to pass up
Wizard's Rockets Despite entering the battlefield tapped, Wizard's Rockets shares some similarities to Chromatic Star as they both let you filter mana and draw a card when they die
That said, players can vote against this, especially if they'll lose important cards, so at least you can plan your game around getting two important cards back