Magnetic Mountain - Revised Edition - 163

Enchantment

Mana Cost: {1}{R}{R}

Blue creatures don't untap during their controllers' untap steps.
At the beginning of each player's upkeep, that player may choose any number of tapped blue creatures they control and pay {4} for each creature chosen this way. If the player does, untap those creatures.

Rare · Revised Edition · #163 (3ED)

Illustrated by Susan Van Camp