Whatever the best or most crucial land in your deck is, Crop Rotation will find that for you, and the land it puts in the graveyard is usually relevant too
On top of that, the spells are actually playable
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The Herald will keep you alive once you would lose the game, while also preventing your opponent from winning the game
For example, if the creature card returned by Defossilize is somehow not a creature once it's on the battlefield, it can still explore
If a card copied by one of the tokens had any "when [this permanent] enters the battlefield" abilities, then the token also has those abilities and will trigger them when it's created