I know I kinda-suggested using a threshold of three, but this is way too similar to battalion now that I think about it. It's a bit more open-ended because you can have Merfolk Looters helping, and it's cool (and strong) that this works both on defense and outside of combat, but I'm wondering if there's a way to make this not feel like it's stepping on battalion's toes.

how about no untapped creatures. it hasnt been done yet on official cards. the closest is a loose cycle in Prophecy mentioning no untapped lands. however there are 4 results in multiverse here.

Those 4 results all probably come from the red mechanic in the Community Set. There's technically more in that set, but, if I remember, we were split on how we wanted to template it. A Prodigal Pyromancer that deals 2 damage when the ability resolves needs to say 'no untapped creatures'. A creature that gets +2/+2, however, just needs to say "as long as all creatures you control are tapped." You know... because the ability doesn't mean anything if the creature isn't on the table...

On a separate side note, Battalion used to not require the creature with Battalion to be one of the attacking creatures. So you're technically treading really close to the original impetus behind the mechanic. Not that I think there's anything wrong with that... it's a good mechanic. I hope comes back a little closer to this someday.

amuseum: It was like that, but it changed. It may have had to do with my explanation on Ally's Cry's comments.