Cheapest priced copy (Ikoria: Lair of Behemoths): $0.35 at Card Kingdom, near mint, their price list as of .
Parcelbeast 
Creature — Elemental Beast · 2/4 · Uncommon · Ikoria: Lair of Behemoths · #199
Mutate {G}{U} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
{1}, {T}: Look at the top card of your library. If it's a land card, you may put it onto the battlefield. If you don't put the card onto the battlefield, put it into your hand.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 199 | Uncommon | $0.39 | $0.49 |
| Ikoria: Lair of Behemoths | 304 | Uncommon | $0.35 | $0.99 |
| The List | IKO-304 | Uncommon | $0.35 | — |
3 rulings from Wizards of the Coast
- 17 April 2020If the top card of your library is a land card, you may just put it into your hand instead of putting it onto the battlefield. If you do, you don’t reveal that it’s a land card.
- 17 April 2020Parcelbeast’s effect doesn’t count as playing a land. It can put a land card onto the battlefield even if you’ve already played your land for the turn.
- 17 April 2020If you don’t put the top card of your library onto the battlefield, you put it into your hand without revealing it.