Elesh Norn, Mother of Machines (Showcase) (Step-and-Compleat Foil) [ONE - 420] The List Reprints if it's the first combat

if it's the first combat phase of the turn

where X is Esper Sentinel’s power

Whenever an opponent searches their library

you may sacrifice any number of other creatures

then return it to the battlefield transformed under its owner's control

Elesh Norn, Mother of Machines (Showcase) (Step-and-Compleat Foil) [ONE - 420] The List Reprints if it's the first combatRarity: M #: 420 Creature Type or Sub Type: Legendary Creature Phyrexian Praetor P: 4 T: 7 Rules Text Contains: Vigilance If a permanent entering the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time. Permanents entering the battlefield don't cause abilities of permanents your opponents control to trigger.