All your modified creatures get trample, and dealing damage with a modified creature lets you thin your deck out a bit by searching for a basic land and putting it into play tapped
This card is only held back if Destiny Board is not on the field
for example, you could throw an enchantment creature into the graveyard to set up delirium or make sure you have enough creatures to trigger Oversold Cemetery
Infinite Impermanence is the only trap card run at three, but due to it being a UR, replacing it with cards such as Metaverse allowing more deck thinning, or Solemn Judgement that can be acquired from bundle deals from the shop a guaranteed Solemn Judgement is always a great way to spend 750 Gems
You should assume that you wont be able to cast four cost spells until turn 5
Giving your creatures undying is a great way to get extra sacrifice fodder by recurring your dorks, and enables lots of infinite loops when paired with a persist creature like Putrid Goblin