If an effect allows you to put a card with particular characteristics onto the battlefield without instructing you to play or cast it, you consider only the characteristics of a modal double-faced card's front face to see if that card qualifies
While this sounds like a downside, we can make it an upside
Many players have been certain of victory, only to have an instant fly from the opponent's hand and ruin their grand plan
In the mid-cost version, we'll be looking at some more rare and super rare card with Resist that can help us have a more dominant presence on the board while you bounce your Merlins around
But I don't think she ever even gets close to that, because I would absolutely pay the 3 life to kill her with any number of cheap removal cards
You can also cast Zacama, Primal Calamity on the cheap and still untap all of your lands to have access to even more mana to use to cast Dinosaurs or activate Zacamas abilities