If the ability that's copied is modal (that is, it says "Choose one " or the like), the copy will have the same mode
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
Youve activated Tezzereths ultimate ability and turned all your artifacts including Trinisphere into creatures
Then, with your creatures safely in play, they all gain trample, preventing your opponents from simply blocking them with a small 1/1 creature
Fight effects are like, just a single mana even with their most recent versions, and Im pretty sure adding a +1/+1 counter doesnt warrant multiplying its cost five-fold
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