Your thing can be basically anything, but this is easiest to see if we look to Kindred decks having a critical mass of creatures of your chosen type and/or cards that care about that type is crucial to amassing synergies and building a board
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Scourge of the Throne gives you one when you attack the player with the most life, Hellkite Charger, and Aggravated Assault both give you extra combat by paying mana, and World at War, Waves of Aggression, and Relentless Assault are all sorceries that give you extra combat (the former two being able to be used twice)
Ambiguity One of my pet peeves with Magic is that certain words are used to mean multiple things
For more, check out the Magic Story pages for Amonkhet , Hour of Devastation , War of the Spark , March of the Machine , Aetherdrift , and Tarkir: Dragonstorm