Put those creature cards onto the battlefield, then shuffle the rest into your library
Or, in other words, youre adding four mana to the cost of one of your spells to fix your mana for that spell
If you activated this card while your opponent controlled no cards, for the rest of this turn you cannot activate cards, or the effects of cards, with the same original name as that banished card
Bloodbraid Challenger is close enough to Bloodbraid Elf to not stain the name, and at a mana value one greater, with the ability to escape, the Challenger hits differently and I'm OK with that
[2] During your opponent's End Phase, if this card is in the GY: You can add it to your hand
Deck facedown in their respective areas