It costs mana to activate, but its also a 1-drop and much less restrictive than Knight of the Reliquary, so it has some advantages that the Selesnya card doesnt have
Legendary Creature - Peasant Halfling Creature (CTRL to add secondary) Defense Mesmerizing Benthid When this creature enters, create two 0/2 blue Illusion creature tokens with "Whenever this token blocks a creature, that creature doesn't untap during its controller's next untap step." This creature has hexproof as long as you control an Illusion
Turn two Hole + Otherworldly Gaze/Tome Scour or turn three Hole + Reunion are the lines you should be looking for
For most WotC era sets, there are 10 or more videos of complete box openings on Youtube, which for the holos means approximately 1-2 sheets worth of cards in total, for rares around 2-3 sheets
However, you don't have to have a one-of-a-kind card like this stored at the bottom of a cupboard or in your loft to make a quick buck