Here's my first build for Tiny Leaders. Probably needs a lot of work, but its pretty fun as is.

So, I've been really trying to make doomsday work, while leaving myself open to all the boardwipes I could need in this format. This is pretty much what I've settled on. Control the board and mill them out until I can get enough mana to successfully combo off.

For those who don't know how doomsday works, you essentially make a pile that looks like this with a cantrip of some kind in hand:

Gitaxian probe -> Predict -> Laboratory Maniac -> Unearth -> Opt.

You then cast your cantrip, draw probe, cast probe, draw predict, cast predict, name lab maniac, mill it, then draw two cards (unearth and opt). Then, cast unearth and return Lab Maniac to play. When he's in play, cast Opt. You can't draw a card, so you win.

While the deck is quite creature light, the ones that are there can both hold attackers at bay and provide some added perks. The sideboard is set up to be more anti-burn and anti-mill (since that's what a lot of folks are building in my area). I've also added a couple more mill cards to help get me over the edge (haven't added glimpse yet because its stupid expensive).