8 cards where the illustration contains “underwear”

Bloodletter (Unhinged #50)
Chaos Warp (Double Masters 2022 #359)
Dark Impostor (Avacyn Restored #92)
Dress Down (Modern Horizons 2 #39)
Leeches (Homelands #9)
Pacifism (Seventh Edition #29)
Primal Vigor (Secret Lair Drop #314)
Volrath's Motion Sensor (Unglued #39)

This search is finished. Now the real work can begin.