all ultimatum cards mtg Ruinous | Ikoria: Lair of Behemoths | Modern discards three cards Eerie Ultimatum

But when you need a board wipe, you can use the Exude Toxin omen, dropping a powerful -X/-X effect that wipes out smaller non-dragon creatures

Before long, you pull off loops with cards like Ancestral Statue or Cloud of Faeries and trigger infinite casts

This ability also works well with other cards incentivizing opponents to attack, such as Propaganda or Ghostly Prison

Chapter III in particular makes attacking feed you cards, so sometimes Shiva plays out like two turns of Moat. You can also try to combine this with other stun effects to draw extra cards, though there arent many of those (mostly just Ice Flan and Omega, Heartless Evolution)

Spells such as Duel for Dominance buff your creatures before they fight an opponent's creature

If your initial draw gives you The Queen, Commanding Prescene, its worth throwing everything else out to get The Queen, Regal Monarch