Id primarily run Beasts with Ravenous Baloth in order to get the lifegain plus putting the creatures into the graveyard for later Nethroi use
You don't have to cast a plotted card if you don't want to (that's to say, it may remain in exile indefinitely if you want), but if you do cast it then you have to cast it for 0 in other words, alternative doesn't mean optional in this case
All the same, we are likely to see some support in future sets, with Villain being an easier type to attach to a creature
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The news comes via Wizards of the Coast's own Blake Rasmussen, who posted an announcement to the official Magic: The Gathering website on Apr
This is particularly useful in sacrifice decks that benefit from killing their own creatures