Forsaken Wastes

This has the supertype world. When a world permanent enters, any world permanents that were already on the battlefield are put into their owners' graveyards. This is a state-based action called the "world rule." The new world permanent stays on the battlefield. If two world permanents enter at the same time, they're both put into their owners' graveyards.

If an effect says to set your life total to a certain number, and that number is higher than your current life total, that effect will normally cause you to gain life equal to the difference. With Forsaken Wastes on the battlefield, that part of the effect won't do anything. (If the number is lower than your current life total, the effect will work as normal.)

If a cost includes life gain (like Invigorate's alternative cost does), that cost can't be paid.