Cheapest priced copy (The List): $3.99 at Card Kingdom, near mint, out of stock, their price list as of .
Rotting Regisaur 
Creature — Zombie Dinosaur · 7/6 · Rare · Core Set 2020 · #111
At the beginning of your upkeep, discard a card.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $3.99 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Core Set 2020 | 111 | Rare | $4.49 | $4.49Out of stock |
| The List | M20-111 | Rare | $3.99Out of stock | — |
| Core Set 2020 Promos | 111p | Rare | $3.99Out of stock | $4.99Out of stock |
| Core Set 2020 Promos | 111s | Rare | — | $4.99Out of stock |
| Secret Lair Drop | 852 | Rare | — | $4.49 |
2 rulings from Wizards of the Coast
- 12 July 2019If you have no cards in hand when Rotting Regisaur’s triggered ability resolves, you simply don’t discard any cards. There’s no penalty for being unable to do so.
- 12 July 2019Because the upkeep step is before the draw step, you discard for Rotting Regisaur’s triggered ability before you draw a card for your turn.