Word of Command

You may Command your opponent to play a land (if they have not already done so this turn).

If there is a non-mana way to cast a spell, as with Pitch Spells, you may require that way to be used if it is possible to do so.

Your opponent can't counter the Word of Command after letting you look at their hand, but they can attempt to counter the spell you force them to cast.

Since this spell is an instant, your opponent gets a chance to respond to it as normal. Once this spell resolves, you look at your opponent's hand and choose a card. Note that it is common practice to respond to Word of Command by using up any spells or mana you have prior to letting it resolve.

You must order your opponent to play the chosen card if it is possible to do so.

During the resolution of this spell, that player plays the chosen card.

You do get to choose which lands get tapped. You can make them choose an optional mana generating ability of the land that they tap, such as making them tap and sacrifice the land instead of just tap it.

To "play a card" is to either cast a spell or to put a land onto the battlefield using the main phase special action.