
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.
Merrow Harbinger has 2 printings, first in Lorwyn (2007). EDHREC ranks it #9,402 among Commander cards. It appears most in Hakbal of the Surging Soul decks (4,879 on EDHREC).
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.