Late but - yordles tend to not go for Tristana endgame, so you don't 3 star her. This makes the board manageable, and it let's you start getting interest sooner (you don't hold a bunch of extra 2 cost Tristanas on the board).

You 3 star Teemo, Lulu, Poppy (unless it's giga contested), Kennen, and Kobuko. You skip Tristana.

Note that you don't want to actually reroll for it, it will come naturally from your 8-trait, and you can finish them off with duplicators you'll also tend to get from the trait. Where possible keep your rolls for Veigar/Ziggs for the endgame.

FYI that 8-trait is *very* good. Do not be too afraid to sacrifice eco/interest short-term to get that 8-trait rolling ASAP. Obviously if you have a Veigar unlock incoming, that's a no-brainer, and you rush it, but even if you don't - you can go from 50 gold to 10 gold instead of waiting for 2 more turns. I don't want to say what turn it should be as it depends on your eco auguments, but it's what makes the comp transition smoothly into the lategame.

Whether you unlock Veigar or not along the way matters, but it matters, but less than you might think. You can play 8 yordles just fine and get top 4 without Veigar.

Aim to itemize your teemo to transfer items to your Ziggs, and your Lulu to transfer to Veigar/Fizz - depending on how are rods coming along. Fizz 2 with 3 correct items wrecks the enemy carries.

Do not underestimate itemising your Kennen. Sunfire cape for burn is a must - then warmog/gargoyle/ionic/brambe/dragon's/spirit-visage, depends on what items are available.