It's not bad, and it's a cool nod to Coldsnap, but animating lands isn't something blue is set up to take full advantage of
In fact, there are only two Iconic cards available in all of Lorcana (at least for the moment)
Youve activated Tezzereths ultimate ability and turned all your artifacts including Trinisphere into creatures
Note that cracking a fetchland counts as searching their library, so folks might not break that Terramorphic Expanse or their Polluted Mire unless they are needed, which is still a win for you as you slow them down
It can target any player, so its not strictly worse than any other card, but it just seems like a bad portent, when you cant just have Card not found
If you manage to drop Mystic Remora on turn one in a Commander game, then nobody is going to pay four mana and youll have too many cards in hand in seconds