Sphinx of the Second Sun 
Creature — Sphinx
$3.90 #2299 0.49 5.9 years
Flying
At the beginning of each of your postcombat main phases, there is an additional beginning phase after this phase. (The beginning phase includes the untap, upkeep, and draw steps.)
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Cards similar to Sphinx of the Second Sun 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.
Shadow of the Second Sun92%
$0.99↓#3690↓1.28↑2.3 years↓
"At the beginning of each of enchanted player's postcombat main phases, there is an additional beginning phase after this phase."
Lady of Laughter80%
$0.33↓#19883↓0.07↓3.1 years↓
"Flying"
Pestermite78%
$0.25↓#11024↓0.12↓19.0 years↑
"Flying"
Cyclonus, the Saboteur // Cyclonus, Cybertronian Fighter78%
$0.92↓#12559↓0.31↓3.9 years↓
"Whenever this card deals combat damage to a player, convert it. If you do, there is an additional beginning phase after this phase."
+1 more matching line
Stormchaser Drake74%
$0.32↓#9064↓0.07↓4.9 years
"Flying"
Paradox Haze73%
$4.16↑#2917↓0.4320.0 years↑
"At the beginning of enchanted player's first upkeep each turn, that player gets an additional upkeep step after this step."
Obeka, Splitter of Seconds72%
$0.31↓#5930↓0.62↑2.5 years↓
"Whenever this card deals combat damage to a player, you get that many additional upkeep steps after this phase."
Full Throttle71%
$1.63↓#1323↑0.69↑1.7 years↓
"After this main phase, there are two additional combat phases."
High-Society Hunter71%
$0.30↓#4368↓0.10↓1.9 years↓
"Flying"
Consecrated Sphinx71%
$25.11↑#653↑1.82↑15.7 years↑
"Flying"
Archon of Coronation70%
$0.49↓#6727↓0.76↑5.9 years
"Flying"