If a die is rerolled, the original roll essentially never happened: it doesn't cause any abilities to trigger, and no effect that cares about die rolls will consider it
1st Edition cards are the most valuable, followed by Shadowless prints (early Unlimited runs without the shadow on the right side of the artwork box)
TYPA tracks Walmart Pokemon listings continuously and alerts you the instant one returns
Still, there are certainly some big-ticket cards that are genuinely irreplaceable for either their unique effect or raw power level
Bala Ged Recovery, Oversold Cemetery and Emeria Shepherd are leveled up ways to do this
Ranking: Could Be Fun Neriv, Crackling Vanguard Neriv reminds me of a Mardu version of Gimbal, Gremlin Prodigy, but instead of making tokens, we get impulse draw, which lets us take full advantage of cards that want us to play cards from exile, like Pia Nalaar, Consul of Revival, Prosper, Tome-Bound, and Iraxxa, Empress of Mars