When Watertrap Weaver enters the battlefield, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.
The river is a powerful friend.
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![Watertrap Weaver - [Foil] Ixalan (XLN)](http://cdn.shopify.com/s/files/1/0147/6729/2516/products/0d973568-d7b0-443f-a09d-44f6b02da5d4_92ba189e-7b34-482a-9348-395539c25584_530x@2x.jpg?v=1627438601)