Because exiling a card with foretell from your hand is a special action, you can do so any time you have priority during your turn, including in response to spells and abilities
(2025-10-02) To airbend one or more permanents and/or spells means to exile each of those objects
So while at first glance this looks like paying five mana for three mana's worth of stuff that is all a little narrow or unexciting when it all comes together it is substantially greater than the sum of its parts
Sadly, the precon only comes with 4 legendary lands and I feel this would have been an amazing opportunity to increase the quality of the land base a little more here compared to other recent precons
Seeing this card in person is an experience in itself, as the rainbow sparkles really pop off the card
The problem with Strip Mine is that its just too efficient, and giving up a land drop to set an opponent a land drop behind is not only pretty effective in 1v1 formats, but gets put over the edge with that pesky artifact called Crucible of Worlds