Parcelbeast
Creature — Elemental Beast
Mutate (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.)
, 
: 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.
Milivoj Ćeran
Rulings
If 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.
(wotc • 2020-04-17)
Parcelbeast’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.
(wotc • 2020-04-17)
If you don’t put the top card of your library onto the battlefield, you put it into your hand without revealing it.
(wotc • 2020-04-17)
Rulings
If 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.
(wotc • 2020-04-17)
Parcelbeast’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.
(wotc • 2020-04-17)
If you don’t put the top card of your library onto the battlefield, you put it into your hand without revealing it.
(wotc • 2020-04-17)