The Great Confluence

When The Great Confluence Enters the battlefield, Exile all other Permanents, and then
player gains a Confluence Emblem with "at the beginning of your first main phase, choose one:
• You may put a land from Exile onto the battlefield.
• Until your next turn, you may cast a
spell from Exile.
• Lose half your life, create a copy of this emblem."
Whenever a card is put into a graveyard, exile it.