It's not optional
In Draft you open three packs and pass them around, picking a card for your deck one at a time
the card number can be found in the bottom left of each card, with the format being X/204 (X is the card number, from 1-204), then EN (the card language code, for English cards) and finally, the set number
They make for awful late game topdecks, but they can fix your colors and accelerate out a 4-drop on turn 3, which is something nearly every green deck is interested in doing
The red artifact creature Roving Actuator uses Void, another new mechanic from Edge of Eternities, meaning youll want to play it on a turn when a nonland permanent has left the battlefield or a spell was warped in order to exile an instant or sorcery from your graveyard that costs 2 mana or less and then cast a copy of it for free
The two greatest culprits, in my opinion, are counter and play