Sphinx of the Second Sun 
Creature — Sphinx
$1.40 #2448 0.42 5.8 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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Shadow of the Second Sun92%
$0.88↓#3657↓0.58↑2.2 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%
$0.32↓#19544↓0.53↑3.0 years↓
"Flying"
Cyclonus, the Saboteur // Cyclonus, Cybertronian Fighter78%
$0.86↓#12438↓0.503.8 years↓
"Whenever this card deals combat damage to a player, convert it. If you do, there is an additional beginning phase after this phase."
Paradox Haze72%
$3.51↑#28830.3419.9 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%
$0.29↓#5816↓0.61↑2.4 years↓
"Whenever this card deals combat damage to a player, you get that many additional upkeep steps after this phase."
Tide Skimmer72%
$0.10↓#11649↓0.11↓6.2 years
"Flying"
Welcoming Vampire72%
$1.94↑#424↑0.22↓4.8 years
"Flying"
Skyline Despot72%
$0.59↓#3700↓0.21↓10.0 years↑
"Flying"
Full Throttle70%
$4.93↑#1376↑0.491.6 years↓
"After this main phase, there are two additional combat phases."
Loyal Drake70%
$0.29↓#5203↓0.23↓8.1 years↑
"Flying"
Voracious Tome-Skimmer70%
$0.30↓#7588↓0.00↓0.6 years↓
"Flying"