The card draw alone is enough reason to play this card, but in any control shell, you can make that second ability not even a downside and eventually win off the first ability
You dont even need to be making flashy plays with Raul
Whats really interesting is the origin of that device
Bouncing can be used as a stalling technique, such as when you force an opponent to recast an expensive creature, a way to grant you a second chance to counter a problematic permanent, and a excellent method to kill tokens
Make sure you've got a card draw engine to ensure you don't run low on instants and baiting people into action might make this deck one of the better fits for the impetus cycle which calls upon opponent's creatures to attack your opponents
Sure, Ephemerate is aggressively costed, but it cant untap your lands, untap your mana rocks or perma-steal creatures youve temporarily gained control of