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
Think of the Djinn as Illusionary Forces with a different type of upkeep
This 3-mana artifact creature can become a force to be reckoned with if you get the right combination of counters, like first strike and deathtouch
They lose 2 life per card drawn while you gain 2 life per card drawn
It keeps your hand full and your land drops consistent, especially against ramp-heavy tables
They go into a kind of storage bank, like poison counters and rad counters