Transforming into Vault of Catlacan is worth the investment in artifact-heavy decks
Its one thing to play with two land, or one, or even zero and just plan on using lots of artifacts and Rituals, but to actually play with zero cards capable of generating mana at all
If you don't have six or more permanent cards in your graveyard at that time, the ability won't resolve and none of its effects will happen
Tergrid states that whenever an opponent sacrifices a non-token permanent or discards a card, you can put that card onto the battlefield under your control
The evidence is convincing: have you ever noticed that Friday Night Magic is always on Friday nights, the most common date night
Beyond the synergy and card advantage, the deck plays a handful of powerful cards in the 99, such as Black Market Connections