copying it and attacking right away is better
At the time of writing, it is listed on TCGPlayer at $499.99
Attune basically stockpiles energy for a bonus effect later in the game at no additional cost
Yet for some reason when it came time to put together Innistrad Remastered Wizards went for Thalia, Heretic Cathar instead
Cards like Scavenging Ooze and Cling to Dust leverage this trigger to remove the undying creature from the graveyard with the trigger still on the stack, preventing it from returning
This is a fairly straightforward aristocrats-style deck, complete with all your typical Blood Artist impressionists (Falkenrath Noble and Cruel Celebrant), sac outlets with Yahenni, Undying Partisan or Bartolome del Presidio, and more