Containment Membrane⁣ - Oath of the Gatewatch⁣ (Common)⁣ [52]

Containment Membrane is an Aura enchantment that prevents an enchanted creature from untapping during its controller's untap step, effectively immobilising it. With a surge cost of just {U}, it can be cast at a lower mana cost if you or a teammate has already played a spell that turn, making it a flexible option in tempo strategies. This card works well in control decks that aim to hinder opponents' creatures while maintaining board presence.