Although you rely on getting your Laboratory Maniac into play before you deck yourself the fact that you plan to draw through your deck means you don't need to bother assembling your combo, it will just appear
The most impactful rotation will definitely be the Surveil Lands, a cycle of ten dual Lands with basic Land types that enter tapped but let you Surveil on entry
If you have ten bullets in your deck, even if youre playing 70 cards and viewing them all as bonus slots that dont take away from your other cards, youre still one-seventh bullets, meaning an opening hand will have an average of one bullet, which is like taking a mulligan every game if you assume bullets are narrow and not worth a card in the wrong place
However, one of the drawbacks of taking that first turn is that you cant use Supporters right away
If a match starts going in your opponents favor, you can use Sabrina to switch out a key Pokmon and swing the odds back in your direction