Alpine Guide
Snow Creature — Human Scout
When this creature enters, you may search your library for a Mountain card, put that card onto the battlefield tapped, then shuffle.
This creature attacks each combat if able.
When this creature leaves the battlefield, sacrifice a Mountain.
Wayne Reynolds
Modern Horizons (MH1)
• #117Rulings
If Alpine Guide can't attack for any reason (such as being tapped or having come under a player's control that turn), then it doesn't attack. If there's a cost associated with having it attack, its controller isn't forced to pay that cost, so it doesn't have to attack in that case either.
(wotc • 2019-06-14)
Rulings
If Alpine Guide can't attack for any reason (such as being tapped or having come under a player's control that turn), then it doesn't attack. If there's a cost associated with having it attack, its controller isn't forced to pay that cost, so it doesn't have to attack in that case either.
(wotc • 2019-06-14)