Umbris, Fear Manifest + Opposition Agent + Hive Mind + Mana Severance + Blade of Selves

Umbris, Fear Manifest

Opposition Agent

Hive Mind

Mana Severance

Blade of Selves

How it works

1. Cast Mana Severance by paying 1.
2. Hive Mind triggers, causing each opponent to copy Mana Severance.
3. Resolve each opponent's Mana Severance, searching for and exiling all land cards from their libraries.
4. Resolve your Mana Severance, choosing not to exile any land cards from your library.
5. Move to your combat step.
6. Attack with Umbris.
7. Umbris triggers, creating a token copy of Umbris for each opponent you have, with each token tapped and attacking a different opponent.
8. Put all but one Umbris into your graveyard due to the legend rule.
9. Umbris triggers for each Umbris token that enters and each Umbris token triggers for itself and each other Umbris that enters.
10. Resolve the Umbris triggers, revealing no lands from opponent libraries and exiling each opponent library.