Gwenom, Remorseless 
Legendary Creature — Symbiote Spider Hero
$5.05 #2886 0.97 1.0 years
Deathtouch, lifelink
Whenever Gwenom attacks, until end of turn, you may look at the top card of your library any time and you may play cards from the top of your library. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost.
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Cards similar to Gwenom, Remorseless 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.
One with the Multiverse84%
$2.65↓#1919↑0.74↓3.8 years↑
"Once during each of your turns, you may cast a spell from your hand or the top of your library without paying its mana cost."
The Lunar Whale83%
$0.31↓#11005↓0.34↓1.2 years
"As long as this card attacked this turn, you may play the top card of your library."
Bolas's Citadel80%
$8.51↑#269↑1.72↑7.3 years↑
"You may play lands and cast spells from the top of your library. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost."
Gifted Aetherborn80%
$0.36↓#4724↓0.19↓9.6 years↑
"Deathtouch, lifelink"
Fortune Teller's Talent80%
$0.59↓#3772↓0.28↓2.1 years↑
"As long as you've cast a spell this turn, you may play cards from the top of your library."
Experimental Frenzy78%
$0.29↓#14108↓0.26↓7.9 years↑
"You may play lands and cast spells from the top of your library."
The Belligerent78%
$0.34↓#6785↓0.50↓2.8 years↑
"Whenever this card attacks, create a Treasure token. Until end of turn, you may look at the top card of your library any time, and you may play lands and cast spells from the top of your library."
Vizier of the Menagerie78%
$0.36↓#4270↓0.26↓9.4 years↑
"You may cast creature spells from the top of your library."
Glarb, Calamity's Augur77%
$4.28↓#3693↓0.36↓2.1 years↑
"You may play lands and cast spells with mana value 4 or greater from the top of your library."
+1 more matching line
Augur of Autumn77%
$0.34↓#1131↑0.23↓4.9 years↑
"You may look at the top card of your library any time."
Syr Vondam, the Lucent76%
$0.23↓#12321↓0.23↓1.1 years
"Deathtouch, lifelink"
The Reality Chip76%
$4.02↓#1059↑0.29↓4.5 years↑
"As long as this card is attached to a creature, you may play lands and cast spells from the top of your library."
Johann, Apprentice Sorcerer76%
$0.26↓#12545↓0.40↓3.0 years↑
"You may look at the top card of your library any time."
Korlessa, Scale Singer76%
$0.20↓#3674↓0.15↓4.2 years↑
"You may look at the top card of your library any time."
Verge Rangers76%
$0.25↓#5386↓0.16↓6.4 years↑
"You may look at the top card of your library any time."
Ranger Class75%
$0.38↓#7478↓0.17↓5.1 years↑
"You may cast creature spells from the top of your library."
Fblthp, Lost on the Range74%
$0.37↓#5037↓0.15↓2.4 years↑
"The top card of your library has plot. The plot cost is equal to its mana cost."
Thundermane Dragon74%
$1.22↓#3647↓0.31↓1.4 years
"You may look at the top card of your library any time."
Assemble the Players74%
$0.34↓#4632↓0.21↓2.6 years↑
"You may look at the top card of your library any time."
Into the Pit73%
$0.30↓#5865↓0.23↓1.9 years
"You may cast spells from the top of your library by sacrificing a nonland permanent in addition to paying their other costs."