Being able to Morph any character with a shift ability on top of Morph is fantastic, and players are bound to be clamoring for copies
Your reanimation spells will typically cost much less than your opponents will spend on their biggest creatures, so you will spend far fewer resources while exerting similar, if not stronger, pressure on the table
They will also help you to shuffle the cards more easily, letting you slide two halves of a deck gently together rather than bridging them
Mox Opal and Gilded Goose play extremely well together, as a draw consisting of both and a Mishras Bauble could allow you to cast Urza, Lord High Artificer on Turn 2, for example
Void Gorgeous Zhulodok is a 7/4 Eldrazi for six mana that gives colorless spells with mana value seven or greater that you cast from your hand Cascadetwice
The mana value of a split card is the total cost of both sides, so this has a mana value of four