This, on the other hand... I like what's going on, but there's memory issues. And the ability is a drawback... one with benefits, but a drawback none the less.

Do you think it would be fun enough to have chain creatures just get a +1/+1 counter if another creature was cast this turn, or is that not interesting enough? I am trying to avoid using +1/+1 counters, but... hmm... I'm going to need to think about this.

I think it's funny that a card like this would have a memory issue, when it's basically an Aura creature. I suppose it's just hard to stack creatures on other creatures like you can with equipment.
This ability does open some nice design space, though, like creatures that give bonuses to creatures that are chained to them.

I don't not like it. I'd be a little surprised if this ability was printed, but I'd play with it and enjoy it. It would be nice to see a set sometime that was designed only for one player demographic. Or maybe have three sets come out in one year, all three of them aiming for a particular customer. Don't like the Spike mechanics in "Return to Otaria", Pick up a pack of "Sixth Dawn". It's nothing but combos...

The idea of "Aura creatures" starts alarm bells in my head. The general consensus as to why animated Auras fall off in the first place is that it'd get brainbendingly confusing if you had Auras on a creature also attacking alongside that creature, or even worse blocking that creature. It does have nice design space, I'll certainly give you that, but I fear the gameplay confusion possibility may be too much.