Haexl, Legend Hunter

When Haexl, Legend Hunter enters the battlefield, destroy all other legendary creatures
you don't control. Whenever another legendary creature you don't control enters play, it loses all abilities and is an enchantment with "You can't
gain life, draw cards, or play lands. On the
beginning of your upkeep, you lose 5 life.
Destroy target land you control: Remove target
card you don't control from the game.