When a player uses X Speed, their active Pokemon can retreat with one less Energy
Some of that is just good fortune in how all these effects are worded, but Id say its more that discarding is an inherently effective way to interface with Magic s core mechanics
THE JOLLY BALLOON MAN Watching horror movies is a Halloween tradition in many households, and Duskmourn: House of Horrors is loaded up with references to modern horror tropes, but The Jolly Balloon Man is the one that stands out the most for me
Even so, the odds of pulling Thought Vessel in a deck of 99 (excluding the commander, who goes into the command zone) are slim, so adding Reliquary Tower can increase your odds of having a limitless hand size
Or if you want to be a little cheeky, you can Imprint it with interactive spells, like Counterspell, Reality Shift, or Suspend