it could be with combat damage thanks to our big beaters like Artisan of Kozilek, or it could be casting doubled Treacherous Terrains with Swarm Intelligence out, then getting it back with Volcanic Vision to cast it again
Battles which, at least in their initial incarnation in March of the Machine, are all specified as the Siege type are an entirely new type of card, let alone double faced card
There are three sets of Meld card pairs in The Brothers' War: Urza, Mishra, and Titania Powerstone tokens, as first seen on the Dominaria United planeswalker card Karn, Living Legacy , are also a major mechanic in The Brothers' War
The Aroma deck changes that, introducing an archetype relying on something that nearly no other deck cares about: life point gain