In this instance, the Link-4 Link Monster on the field would have to be classified as 1 material, therefore 3 more materials would be needed in order to meet the summoning requirements of the card
(Scryfall note) Yuma must be on the battlefield for its last ability to trigger
Even beyond the attacking strength of Dark Watch, its ability to search out either WANTED: Seeker of Sinful Spoils for a free draw is an obvious advantage for a deck that relies on Air Lifter and Hydrant, another searcher in the deck, to kick-start its core combo
In the old days, it was a card with low practicality that could be put into play by using a super low-tech combo such as Scapegoat+ DNA Surgery
I suspect Voidmage will not remain in the A cube long at all with his ever declining play time unless a really juicy wizard lord is printed
The reason is that Sire of StagnationSire of Stagnation cares about when lands enter under your opponents' control, not your own