8/9/2016 - Here's a drawback keyword for creatures that are bad at consuming a blocker's attention.
This merfolk is bad at walking on land, making it easy to block.
This dino is just slow.
And this keyword isn't worth keywording. First, drawback mechanics are a real hard sell, so they've got to be positively dripping with flavor and/or exciting interactions within the set. Second, there's not remotely enough design space to make 8+ interesting plodding creatures.
Instead, we just spell out the effect on the one or two cards where it's interesting enough to bother.