". . . it's that the lure of the sea is impossible to ignore."

Grizzled Angler // Grisly Anglerfish

{6}: Creatures your opponents control attack this turn if able.

"There's no question that these waters are treacherous, but if there's one thing I've learned in all my years of sailing . . ."

{T}: Mill two cards. Then if there is a colorless creature card in your graveyard, transform Grizzled Angler.

Innistrad Remastered

Eldritch Moon

{T}: Put the top two cards of your library into your graveyard. Then if there is a colorless creature card in your graveyard, transform Grizzled Angler.

For more information on double-faced cards, see the Shadows over Innistrad mechanics article (http://magic.wizards.com/en/articles/archive/feature/shadows-over-innistrad-mechanics).

If a creature affected by Grisly Anglerfish’s effect hasn’t been under its controller’s control since the turn began, is tapped, or is affected by a spell or ability that says it can’t attack, then it doesn’t attack. If there’s a cost associated with having that creature attack, its controller isn’t forced to pay that cost, so it doesn’t have to attack in that case either.

If you have a colorless creature card in your graveyard while you control Grizzled Angler, it won’t transform yet. It only transforms while its activated ability is resolving.