Historian's Boon 

Enchantment
$1.78 #6792 0.05 4.1 years
Whenever this enchantment or another nontoken enchantment you control enters, create a 1/1 white Soldier creature token.
Whenever the final chapter ability of a Saga you control triggers, create a 4/4 white Angel creature token with flying and vigilance.
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Cards similar to Historian's Boon expected a card that isn't here?
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Gremlin Tamer79%
$0.22↓#8787↓0.002.1 years↓
"Whenever an enchantment you control enters and whenever you fully unlock a Room, create a 1/1 red Gremlin creature token."
Setessan Skirmisher79%
$0.07↓#28473↓0.006.7 years↑
"Whenever an enchantment you control enters, this creature gets +1/+1 until end of turn."
Ajani's Chosen78%
$0.27↓#4102↑0.34↑13.3 years↑
"Whenever an enchantment you control enters, create a 2/2 white Cat creature token. If that enchantment is an Aura, you may attach it to the token."
Nexus Wardens78%
$0.21↓#17171↓0.116.7 years↑
"Whenever an enchantment you control enters, you gain 2 life."
Oakheart Dryads78%
$0.09↓#24362↓0.0012.5 years↑
"Whenever this creature or another enchantment you control enters, target creature gets +1/+1 until end of turn."
Ghostly Dancers76%
$0.37↓#3968↑0.072.1 years↓
"Whenever an enchantment you control enters and whenever you fully unlock a Room, create a 3/1 white Spirit creature token with flying."
Archon of Sun's Grace76%
$0.32↓#1249↑0.18↑6.7 years↑
"Whenever an enchantment you control enters, create a 2/2 white Pegasus creature token with flying."
Oath of the Ancient Wood76%
$0.23↓#20112↓0.0013.3 years↑
"Whenever this enchantment or another enchantment you control enters, you may put a +1/+1 counter on target creature."
Go-Shintai of Life's Origin74%
$8.40↑#5142↑0.25↑4.7 years
"Whenever this card or another nontoken Shrine you control enters, create a 1/1 colorless Shrine enchantment creature token."
Pious Wayfarer74%
$0.16↓#24153↓0.20↑6.7 years↑
"Whenever an enchantment you control enters, target creature gets +1/+1 until end of turn."
Ondu Spiritdancer74%
$9.64↑#1668↑0.55↑3.2 years
"Whenever an enchantment you control enters, you may create a token that's a copy of it. Do this only once each turn."
Underworld Coinsmith72%
$0.26↓#9946↓0.0712.5 years↑
"Whenever this creature or another enchantment you control enters, you gain 1 life."
Erratic Apparition72%
$0.14↓#22483↓0.062.1 years↓
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gets +1/+1 until end of turn."
+1 more matching line
Boon of the Spirit Realm71%
$5.69↑#4751↑0.22↑3.2 years
"Whenever this enchantment or another enchantment you control enters, put a blessing counter on this enchantment."
Triton Waverider70%
$0.07↓#29121↓0.066.7 years↑
"Whenever an enchantment you control enters, this creature gains flying until end of turn."
Eidolon of Blossoms70%
$1.86↑#942↑0.34↑12.5 years↑
"Whenever this creature or another enchantment you control enters, draw a card."
Steelclad Spirit70%
$0.09↓#29432↓0.004.9 years
"Whenever an enchantment you control enters, this creature can attack this turn as though it didn't have defender."
Grim Guardian70%
$0.33↓#3403↑0.18↑12.5 years↑
"Whenever this creature or another enchantment you control enters, each opponent loses 1 life."
Luminous Angel70%
$0.71↓#22849↓0.18↑23.0 years↑
"At the beginning of your upkeep, you may create a 1/1 white Spirit creature token with flying."