Merrow Harbinger 73 (Lorwyn)

Islandwalk (This creature can't be blocked as long as defending player controls an Island.) When this creature enters, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top.

NM - $5.20
LP - $4.20
MP - $3.10
HP - $2.10
DMG - $1.10