You can allow infinite landfall triggers with creatures that put lands from your hand onto the battlefield and cards that bounce lands when they enter the battlefield
Borderless treatments, extended arts, showcases, and all the other flashy Booster Fun promos Wizards has thrown at us might not even impact the price of a cardthat happens on a card-by-card basis
This means you can easily play several songs in a row with Powerline in play , especially if you are lucky enough to have both Powerline and Max Goof on the table at once
Fill it with card draw, cards that cheat out other cards, and mass bounce spells like Consuming Tide
When out it can be a bit of a chilling effect as people may not drop things you'll move to and beat them with before they swing
Yes, they can counter creature spells (they are no different to other spells)