Zell Dincht gets +1/+0 for each land you control
The more fetches you crack, the bigger your Knight becomes, and it'll be a force very quickly
The saddle cost is the lowest at 1, and after you attack with Fortune while saddled, you get to blink both this card and the creature that saddled it
Gravecrawler is also contextually weaker than Bloodghast because there is no Kalastria Highborn/sacrifice outlet with which to abuse it (although Altars Reap is a good start)
Mirage Gate should be considered one of the strongest Pokemon cards alongside Giratina VSTAR because it is essentially the single card that makes any Lost Zone deck work
(Or save it for later!) When a Vault is opened, it will award: One rare Wildcard Two uncommon Wildcards One mythic rare Individual Card Reward One rare Individual Card Reward One uncommon Individual Card Reward Combine that with the daily gold and card rewards, plus the weekly pack rewards, and you should be able to expand your collection fairly quickly