Name:Oketra's Last Mercy
ManaCost:1 W W
Types:Sorcery
A:SP$ SetLife | Cost$ 1 W W | Defined$ You | LifeAmount$ X | References$ X | SubAbility$ DBNoUntap | SpellDescription$ Your life total becomes equal to your starting life total.
SVar:DBNoUntap:DB$ Effect | StaticAbilities$ DontUntap | Triggers$ RemoveEffect | SVars$ ExileEffect | Duration$ Permanent | Name$ Oketra's Last Mercy Effect | SpellDescription$ Lands you control don't untap during your next untap step.

SVar:DontUntap:Mode$ Continuous | EffectZone$ Command | AffectedZone$ Battlefield | Affected$ Land.YouCtrl | AddHiddenKeyword$ This card doesn't untap during your next untap step.

SVar:RemoveEffect:Mode$ Phase | Phase$ Untap | ValidPlayer$ You | TriggerZones$ Command | Static$ True | Execute$ ExileEffect

SVar:ExileEffect:DB$ ChangeZone | Defined$ Self | Origin$ Command | Destination$ Exile 
SVar:X:Count$YourStartingLife
SVar:Picture:http://www.wizards.com/global/images/magic/general/oketras_last_mercy.jpg
Oracle:Your life total becomes equal to your starting life total. Lands you control don't untap during your next untap step.