Meren of Clan Nel Toth is a mythic Legendary Creature — Human Shaman card from Secret Lair Drop (SLD), collector number 52. Current market price: — (foil $46.59), TCGplayer market prices via Scryfall.
Whenever another creature you control dies, you get an experience counter. At the beginning of your end step, choose target creature card in your graveyard. If that card's mana value is less than or equal to the number of experience counters you have, return it to the battlefield. Otherwise, put it into your hand.