Haunt of the Dead Marshes 
Creature — Nightmare Elf
When this creature enters, scry 1.
: Return this card from your graveyard to the battlefield tapped. Activate only if you control a legendary creature.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL