Shadow of the Second Sun 
Enchantment — Aura
$0.88 #3657 0.58 2.2 years
Enchant player
At the beginning of each of enchanted player's postcombat main phases, there is an additional beginning phase after this phase. (The end step happens after the added untap, upkeep, and draw steps.)
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Cards similar to Shadow 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.
Sphinx of the Second Sun92%
$1.40↑#2448↑0.42↓5.8 years↑
"At the beginning of each of your postcombat main phases, there is an additional beginning phase after this phase."
Paradox Haze82%
$3.51↑#2883↑0.34↓19.9 years↑
"At the beginning of enchanted player's first upkeep each turn, that player gets an additional upkeep step after this step."
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