Rhys, the Evermore 

Legendary Creature — Elf Warrior
$0.29 #11413 0.00 0.6 years
Flash
When Rhys enters, another target creature you control gains persist until end of turn. (When it dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)
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Cards similar to Rhys, the Evermore 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.
Angelheart Protector74%
$0.11↓#22106↓0.065.9 years↑
"When this creature enters, target creature you control gains indestructible until end of turn."
Aegis Angel72%
$0.30↑#6893↑0.10↑15.1 years↑
"When this creature enters, another target permanent gains indestructible for as long as you control this creature."
Rage-Scarred Berserker72%
$0.11↓#24857↓0.006.6 years↑
"When this creature enters, target creature you control gets +1/+0 and gains indestructible until end of turn."
The Duke, Rebel Sentry72%
$0.18↓#120310.000.8 years
"
, Remove a counter from this card: Put a +1/+1 counter on another target creature you control. It gains hexproof until end of turn."
Predation Steward70%
$0.06↓#23767↓0.063.6 years↑
"
,
, Remove an oil counter from this creature: Target creature gets +2/+2 until end of turn. Activate only as a sorcery."