Permafrost Trap [Worldwake]

Permafrost Trap [Worldwake]

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Uncommon
Set: Worldwake
Type: Instant — Trap
Cost: {2}{U}{U}
If an opponent had a green creature enter the battlefield under their control this turn, you may pay {U} rather than pay this spell's mana cost. Tap up to two target creatures. Those creatures don't untap during their controller's next untap step.