Blinding Beam

Choose one —
• Tap two target creatures.
• Creatures don't untap during target player's next untap step.
Entwine {1} (Choose both if you pay the entwine cost.)

Modern Masters

Choose one — Tap two target creatures; or creatures don't untap during target player's next untap step.
Entwine {1} (Choose both if you pay the entwine cost.)

Duel Decks: Elspeth vs. Tezzeret

Mirrodin

Choose one Tap two target creatures; or creatures don't untap during target player's next untap step.
Entwine {1} (Choose both if you pay the entwine cost.)

The second mode affects all creatures during the player’s next untap step, including creatures controlled by other players (who may have untapped because of Seedborn Muse, for example) and creatures that weren’t on the battlefield when Blinding Beam resolved.