116/159 - Stoutland V - From Crown Zenith
Removal spells and other cards designed to punt things off the battlefield will specify when battles are a legal target - or use the magic phrase any permanent - and certain instant and sorceries will specifically interact with this newest card type
Fun fact: Its hollow, rock-filled body makes it lighter than it looks, allowing it to move surprisingly fast underground
Create a situation where you can aim for X summons on your opponent's turn, and fight while restraining your opponent
As you get towards to more control style of deck the types of thing you want are more numerous
Since it's an instant, you simply pass your turn, wait until your opponent's upkeep, and then cast it, which is very close to getting an extra turn (the main difference is that your opponent will get to untap)