When you Investigate, you create a Clue token, which you can later sacrifice for to draw a card
As the controller of both abilities (assuming you control both the doll and the binding agony) you get to stack them in either order
Mullalys comment also seems to indicate other characters with the ability to slip between the mortal world and those beyond it will get the Planeswalker treatment
Besides winning via cards like Laboratory Maniac, creature-heavy strategies ensure you wont lose from decking anytime soon
Enchantment Color tag templates(None) Spirit Mirror At the beginning of your upkeep, if there are no Reflection tokens on the battlefield, create a 2/2 white Reflection creature token
Once a creature equipped with Wrecking Ball Arm has been blocked, changing the blocking creature's power to 2 or less won't cause the creature to become unblocked