Fantasia

{t}: add {1} or {s} to your mana pool
{s}{s}{t}: tap target creature does not untap until Fantasia is untapped.
Jadis the White Witch: You'll love it there, Edmund. It has whole rooms simply stuffed with Turkish Delight.
Edmund Pevensie: Couldn't I have some more now? Jadis the White Witch: NO! ...I wouldn't want to ruin your appetite.