10 cards where the full Oracle text includes “(whenever this creature becomes blocked, defending player loses”

Ammit Eternal (Hour of Devastation #57)
Ancestral Hot Dog Minotaur (Unfinity Sticker Sheets #23)
Eternal of Harsh Truths (Hour of Devastation #34)
Frontline Devastator (Hour of Devastation #93)
Khenra Eternal (Hour of Devastation #66)
Manticore Eternal (Hour of Devastation #103)
Merciless Eternal (Hour of Devastation #71)
Neheb, the Eternal (Murders at Karlov Manor Commander #158)
Spellweaver Eternal (Hour of Devastation #46)
Wildfire Eternal (Hour of Devastation #109)

Though this query has ended, its relics still slumber in New Argive.