Ulamog, the Ceaseless Hunger and Ulamog, the Infinite Gyre have two different card names, so you can have both out simultaneously (even though they're both variants of Ulamog, lore-wise)
It has a good amount of power compared to the cost and comes with a special ability that can really put a damper on your opponents initiative
I won a close match at the last RCQ I won by using Aang's Iceberg to lock up an Impended Overlord, had my moth tokens Waterbend to sacrifice it, then have an active Overlord with two new moths to attack my opponent for 10 more damage the following turn
Cram Session gains four life and grabs you a card
The set contains four 60-card decks (with no new card content), four non-premium planeswalker cards with new art, and a 20-card scheme deck containing 20 all-new, unique schemes