If one of the lands in this cycle becomes a creature but you haven't controlled it continuously since your most recent turn began, you won't be able to activate its mana ability or attack with it that turn
However, there are potentially better cards like Drogskol Captain, which provides a similar effect with additional benefits such as hexproof for all Spirits you control
The black staple sees play wherever its legal, and this is a premium version of an otherwise $5-9 card
However, Eldrazi do need to feed on mana, and thats why they physically manifest avatars of themselves
Use them in your decks Once you have printed out your cards, you can use them in your decks for casual play and testing
Leaving mana open is that much more important and you will have some tap lands you need room to get down