It'll constantly give you copies of any creature token, all while growing its own stats to make it harder to deal with
If you are likely to die the next turn unless you draw a key removal spell, you may choose not to attack to ensure you draw those extra cards
Crypt Ghast Most perks Ive listed about Nirkana Revenant, Magus of the Coffers, and Bubbling Muck apply to Crypt Ghast as well, so rather than extoll the virtues of Urborg, Tomb of Yawgmoth and X spells for the 4th time, Ill instead start by saying 4 is a very reasonable mana cost for a one-sided mana doubler before moving on to the other half of Crypt Ghasts text box
So: In: 2x Silent Arbiter and 2x Fabricate Out: 2x Thought Scour , 2x Mind Sculpt Dangerous spells: extirpate and surgical extraction Extirpate and Surgical Extraction are absolutely awesome (and expansive) in a mill deck
Shockingly, the April Fool's LGS battlefield did basically none of that