Dreamshaper Shaman
Enchantment Creature — Minotaur Shaman
At the beginning of your end step, you may pay 
and sacrifice a nonland permanent. If you do, reveal cards from the top of your library until you reveal a nonland permanent card. Put that card onto the battlefield and the rest on the bottom of your library in a random order.
Magic is the true artist's medium.
Steve Prescott
Double Masters 2022 (2X2)
• #108Rulings
If there are no nonland cards remaining in your library, you just randomize your library and continue playing.
(wotc • 2020-01-24)
You can't pay {2}{R} and not sacrifice a nonland permanent, or vice versa. The cost must be paid in full or not at all.
(wotc • 2020-01-24)
While resolving Dreamshaper Shaman's ability, you can't pay {2}{R} more than once or sacrifice multiple permanents.
(wotc • 2020-01-24)
Dreamshaper Shaman can be sacrificed to pay for the cost of its own triggered ability.
(wotc • 2020-01-24)
Rulings
If there are no nonland cards remaining in your library, you just randomize your library and continue playing.
(wotc • 2020-01-24)
You can't pay {2}{R} and not sacrifice a nonland permanent, or vice versa. The cost must be paid in full or not at all.
(wotc • 2020-01-24)
While resolving Dreamshaper Shaman's ability, you can't pay {2}{R} more than once or sacrifice multiple permanents.
(wotc • 2020-01-24)
Dreamshaper Shaman can be sacrificed to pay for the cost of its own triggered ability.
(wotc • 2020-01-24)