Name:Timesifter
ManaCost:5
Types:Artifact
T:Mode$ Phase | Phase$ Upkeep | ValidPlayer$ Player | Execute$ TrigExile | TriggerZones$ Battlefield | TriggerDescription$ At the beginning of each upkeep, each player exiles the top card of their library. The player who exiled the card with the highest mana value takes an extra turn after this one. If two or more players' cards are tied for highest, the tied players repeat this process until the tie is broken.
SVar:TrigExile:DB$ Dig | Defined$ Player | DigNum$ 1 | ChangeNum$ All | DestinationZone$ Exile | RememberChanged$ True | SubAbility$ FindHighestCMCFirst
SVar:FindHighestCMCFirst:DB$ Pump | ImprintCards$ ValidAll Card.greatestRememberedCMC | SubAbility$ FindOne
SVar:FindOne:DB$ Repeat | RepeatCheckSVar$ X | RepeatSVarCompare$ GE2 | ConditionCheckSVar$ X | ConditionSVarCompare$ GE2 | RepeatSubAbility$ DBClear | SubAbility$ DBAddTurn
SVar:DBClear:DB$ Cleanup | ClearRemembered$ True | SubAbility$ DBExile
SVar:DBExile:DB$ Dig | Defined$ ImprintedController | DigNum$ 1 | ChangeNum$ All | DestinationZone$ Exile | RememberChanged$ True | SubAbility$ ClearImprint
SVar:ClearImprint:DB$ Cleanup | ClearImprinted$ True | SubAbility$ FindHighestCMC
SVar:FindHighestCMC:DB$ Pump | ImprintCards$ ValidAll Card.greatestRememberedCMC
SVar:X:Count$ValidExile Card.IsImprinted
SVar:DBAddTurn:DB$ AddTurn | Defined$ ImprintedController | NumTurns$ 1 | ShowMessage$ True | SubAbility$ DBCleanup
SVar:DBCleanup:DB$ Cleanup | ClearRemembered$ True | ClearImprinted$ True
AI:RemoveDeck:Random
Oracle:At the beginning of each upkeep, each player exiles the top card of their library. The player who exiled the card with the highest mana value takes an extra turn after this one. If two or more players' cards are tied for highest, the tied players repeat this process until the tie is broken.