I was curious to if this would work, it gives another card to help get out of those situations where the opponent sets some big cards before you and makes you stalled until you get lucky and ruin them or you lose, it activates Murloc tidecaller after the death rattle is triggered, and makes it slightly harder for them to clear as easy because it stays after one minion kills it so big decks would suffer even more, the only downsides I can think of is you can't draw it via "draw Murloc" cards and it may leave you with no clear "big-ish" card, but it doesn't truely matter if you can't get out of the opponents pin on the board, I'm sure there are other reasons it's not being run but I'd love to know why/if this is an actual good swap maybe.