Beyond just card evaluation topics that leverage creature size, in terms of deck building, having the mindset of 'trying to have slightly more lands (because cards from 4 mana onwards are clearly strong)' and 'being conscious of preparing ways to use mana in the late game' will likely make it easier to win mirrors and the like
Luckily, it looks like Tarkir: Dragonstorm 's release is about to change things for the better, especially because of how the set is handling its Planeswalkers
Summary The worst thing imaginable has happened - Magic: The Gathering's Final Fantasy set includes FF7 Rebirth's horrible toothy Moogles
But its not impossible, and some smart trading can make it a lot easier to keep up with the new releases
The key difference is that, whenever you cast an adventure spell and it resolves, it exiles itself (the card goes on an adventure, according to MTG rules)