Decidueye (11/149) [Sun & Moon: Base Set] SWSH065 his/her opponent cannot place a

his/her opponent cannot place a monster on the field if his/her number of monsters would exceed the number of monsters that are on the field of this card's controller

and loses 100 DEF x its Level

If you Tribute Summon an "Ancient Gear" monster face-up

Set: Battle Pack 2: War of the Giants - Round 2 Card type: Normal Trap Rarity: Super Rare Attack: 0 Defense: 0 Target 1 face-up monster you control and 1 face-up monster your opponent controls

If you control no Spellcaster monsters

Decidueye (11/149) [Sun & Moon: Base Set] SWSH065 his/her opponent cannot place aSet: Sun & Moon: Base Set Type: Grass Rarity: Rare Retreat cost: Colorless