White does the heavy lifting of modifying your creatures with counters and equipment and auras while blue provides evasive threats like Malcolm, Alluring Scoundrel to carry all those modifications
One interesting aspect is how this card interacts with Delirium strategies, potentially enabling the mechanic while also providing a way to recover key permanents
Being able to pay three mana to cast anything from the graveyard for a turn essentially translates to drawing a huge number of cards at a very low cost, but without the randomness that comes with actually drawing the cards
In addition, whenever a Nazgl enters the battlefield, they will trigger Tales of Middle-earths new The Ring Tempts You mechanic, as well as adding a +1/+1 counter to any Wraith creatures (which includes the Nazgl) when a player is tempted by the Ring
Replacement effects commonly offer these unintuitive exceptions, like Doubling Season doubling Loyalty counters on Planeswalkers that enter play
Some card versions are only in foil and some are only in nonfoil