The most natural comparison is the Double Faced Cards in Zendikar Rising that were either spells or tapped lands, but when you played DFCs you could have cards with a range of casting costs, which meant that youd typically want to cast some of them in the early to mid game
A typical mana curve for a Prerelease deck looks something like this: 1 Mana: 12 cards 2 Mana: 78 cards 3 Mana: 56 cards 4 Mana: 34 cards 5 Mana: 23 cards 6 Mana: 01 card and 17 lands
Castle Werewolfenstein With the day/night mechanic out, we made the decision to go forward with double-faced cards
That's a deal that's hard to beat
With Ghalta, Primal Hunger, we have a 12/12 Elder Dinosaur with Trample and a steep mana cost of , except you rarely actually paying 12 to cast it
Since he counts +1/+1 counters for modified, I think that's the best way to run him