Example scene with some playing cards

card.gd

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+extends Node2D
+
+var dragged = false
+var drag_offset
+
+func _ready():
+	set_process_unhandled_input(true)
+	
+func _process(delta):
+	if dragged:
+		var mousepos = get_viewport().get_mouse_position()
+		position = mousepos - drag_offset
+
+func _unhandled_input(event):
+	print("input event!")
+	if event is InputEventMouseButton:
+		if event.button_index == BUTTON_LEFT and event.pressed:
+			dragged = true
+			drag_offset = get_viewport().get_mouse_position() - global_position
+		elif event.button_index == BUTTON_LEFT and !event.pressed:
+			dragged = false

card.tscn

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+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://card.gd" type="Script" id=1]
+
+[sub_resource type="RectangleShape2D" id=1]
+extents = Vector2( 105.74, 143.46 )
+
+[node name="Card" type="Node2D"]
+script = ExtResource( 1 )
+
+[node name="KinematicBody2D" type="KinematicBody2D" parent="."]
+position = Vector2( 536.216, 510.56 )
+input_pickable = true
+
+[node name="Panel" type="Panel" parent="KinematicBody2D"]
+visible = false
+margin_left = -104.0
+margin_top = -143.0
+margin_right = 106.0
+margin_bottom = 141.0
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="KinematicBody2D"]
+shape = SubResource( 1 )
+[connection signal="input_event" from="KinematicBody2D" to="." method="_input_event"]

cardgame.tscn

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+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://card.tscn" type="PackedScene" id=1]
+
+[node name="Cardgame" type="Node2D"]
+
+[node name="Card" parent="." instance=ExtResource( 1 )]
+
+[node name="Card2" parent="." instance=ExtResource( 1 )]
+position = Vector2( 118.019, -91.0798 )
+
+[node name="Card3" parent="." instance=ExtResource( 1 )]
+position = Vector2( 474.641, 118.019 )