Hm, nice. Eladamri's Call on ETB. We've had creature-type-searching like Goblin Matron, Iname as One, and the Boggart Harbinger cycle; assorted self-searchers like Embermage Goblin; equipment search with Godo, Bandit Warlord; CMC-restricted searching on things like Fierce Empath / Treasure Mage / Grozoth; and artifact creature search on Sphinx Summoner. But there's never been a simple "find a creature card" (apart from the somewhat counterproductive Boldwyr Heavyweights). Nice thought.

Thank you. My original plan was to have an upkeep effect like Sylvan Library's, since he got absorbed (?) by the Library, but I thought that would be way to powerful.