Marid of Frost

When Marid of Frost enters the battlefield, tap
target creature an opponent controls. It doesn't
untap on its controller's next untap step.
{g}{u}, {t}: Conjure a card from your hand. (To
conjure a card, put it onto the battlefield face-down. A conjured card is a 2/2 green Djinn creature for as long
as it remains face down. If a conjured card would die, return it to its owner's hand.)