Havi, the All-Father 
Legendary Creature — God Warrior
$0.33 #7928 0.55 2.2 years
Havi has indestructible as long as there are four or more historic cards in your graveyard. (Artifacts, legendaries, and Sagas are historic.)
Sage Project — Whenever Havi or another legendary creature you control dies, return target legendary creature card with lesser mana value from your graveyard to the battlefield tapped.
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Cards similar to Havi, the All-Father expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Teshar, Ancestor's Apostle78%
$0.18↓#1912↑0.37↓8.4 years↑
"Whenever you cast a historic spell, return target creature card with mana value 3 or less from your graveyard to the battlefield."
Jackdaw Savior76%
$0.51↑#4375↑0.38↓2.1 years
"Whenever this creature or another creature you control with flying dies, return another target creature card with lesser mana value from your graveyard to the battlefield."
Sanctum Spirit70%
$0.04↓#29181↓0.33↓8.4 years↑
"Discard a historic card: This creature gains indestructible until end of turn."
Serra Disciple70%
$0.18↓#23705↓0.00↓8.4 years↑
"Whenever you cast a historic spell, this creature gets +1/+1 until end of turn."