If the target creature becomes an illegal target, the Equipment remains on the battlefield unattached
If you mean after the equipped creature leaves the battlefield, then yes, equipment stays in play
Considering the current speed of Standard, the cost on these lands is a dire one, too, since failing to interact in the opening turns can snowball into a loss
Since late 2011, each booster has contained one card printed with a code to redeem cards on the game's digital version (originally Pokemon TCG Online, now Pokemon TCG Live)
Retailers see their shelves of Pokemon cards disappear whenever they have a restock, while pre-orders are so backlogged that The Pokemon Company cant reprint enough to meet orders
That land-off-the-top ability you can do as many times as you scry, so if you can put a ton of lands on the top of your deck and scry a ton you can stack landfall triggers and ramp like mad