In most cases, creature abilities can be used like instants, meaning you activate them on your turn or your opponents turn (as long as they're not tapped already)
As I noted earlier, there were other future teams exploring the design space of Battles, so we knew we wanted to set things up in a way that would be compatible for other functionality and keep design space open for future iterations of Battles
They can also be defender creatures that, when a certain condition is met, can attack
Ashnods Harvester I want Ashnod's Harvester to be good, but I think it's not
Its not remotely balanced, and that bears out in gameplay
8 Bard Class Its hard to think of a card that does more for your legendary creatures than Bard Class