Junk Sleep

Continuous Trap

If your opponent Normal or Special Summons a monster(s): You can change all face-down Defense Position monsters you control to face-up Attack Position. During the End Phase: You can change all monsters you control to face-down Defense Position. You can only use each effect of "Junk Sleep" once per turn.

Rulings – Yugipedia

Printings:

Rise of the Duelist: ROTD-EN080 (Common) - 2020-08-06
2021 Tin of Ancient Battles: MP21-EN156 (Common) - 2021-09-30

Prices:

Cardmarket: 0.07 €
TCGplayer: $ 0.08