Jujakuka, Mage of Power

Eminence - Whenever you cast a spell, if Jujakuka,
Mage of Power is in the command zone or on the battlefield, you may choose one of the following.
• Counter the spell and Cascade Twice.
• Cascade once and subtract one from the
converted mana cost of the spell.
• Tap or untap target permanent.
Menace, Deathtouch.
{3}{t}: The next spell you cast can't be countered.