Seems developmentally interesting. Am very unsure on the numbers.

I think the ability is too hard to nail down. In a lot of decks, you won't have enough creatures to break even. And then some tokens decks will draw many cards off this.

Maybe remove the "you control" clause. Blue loves tapping down opponents things and if they're attacking you go AHA! and draw a bunch of cards. Whether the discard 2 needs to stay? Idk, we'll see in playtesting.

In the U/R deck, you're probably aggro and likely to attack with 5+ creatures at some point.

In the U/G deck you're likely to have a bunch of creatures with guard to make it great.

I don't think the card is weak and I doubt there'll be any token decks in this environment.

If you removed the you control part, the card is likely too good and wouldn't incentivize building around the themes for the clans.

Ok but at least make it 2u instead of 1uu.