It usually triggers at the end of the turn but, ironically, both of my top two cards don't do so
So Im forced into the realm of guesswork and estimation: Based on what we hear from sellers and distributors, plus the likely print run after Fallout, were looking at around 1.5 million packs, which means youve got a 0.13% chance of pulling any serialized card
If you're cash-strapped and want to avoid spending money on microtransactions, there is one pack you need to focus on first when you're on a budget
That covers every printed variant reverse holofoils, secret rares, and the special-art chase cards numbered past 108/108
The other card will be a rare or mythic rare, which could be a stained-glass legend, an extended-art card, or a borderless planeswalker