Protective Bubble 

Enchantment — Aura
$0.31 #12752 0.29 18.9 years
Enchant creature
Enchanted creature can't be blocked and has shroud. (It can't be the target of spells or abilities.)
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Cards similar to Protective Bubble 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.
Whispersilk Cloak94%
$1.89↑#331↑0.44↑22.6 years↑
"Equipped creature can't be blocked and has shroud."
Diplomatic Immunity89%
$2.28↑#6285↑0.50↑26.9 years↑
"Enchanted creature has shroud."
+1 more matching line
Favorable Destiny88%
$0.35↑#20568↓0.41↑29.9 years↑
"Enchanted creature has shroud as long as its controller controls another creature."
+1 more matching line
Veil of Secrecy85%
$0.20↓#15474↓0.00↓21.6 years↑
"Target creature gains shroud until end of turn and can't be blocked this turn."
Zephid's Embrace84%
$0.17↓#17495↓0.05↓27.9 years↑
"Enchanted creature gets +2/+2 and has flying and shroud."
Spectral Cloak82%
$5.11↑#29466↓0.13↓32.3 years↑
"Enchanted creature has shroud as long as it's untapped."
Tricks of the Trade81%
$0.16↓#18529↓0.07↓14.1 years↓
"Enchanted creature gets +2/+0 and can't be blocked."
Tortoise Formation80%
$0.09↓#23832↓0.00↓17.9 years
"Creatures you control gain shroud until end of turn."