A “Domain Aggro” deck in Pauper refers to a deck that utilizes the domain mechanic and aggressive strategies. In Pauper, you are limited to using common rarity cards, making it a budget-friendly format. The domain mechanic cares about the number of basic land types you control, specifically Plains, Island, Swamp, Mountain, and Forest.

The more basic land types you control, the more powerful the domain cards become. Here’s a general idea of how a Domain Aggro Pauper deck works to its advantage:

1. Land Base: You’ll want to include cards that help you control the basic land types. Cards like [[Evolving Wilds]], [[Terramorphic Expanse]], and [[Ash Barrens]] are used to fetch specific basic land types.
2. Domain Cards: The deck includes cards that benefit from having multiple basic land types in play. These cards often become more powerful the more types you have. For example, [[Matca Rioters]] or [[Nacatl Hunt-Pride]] can get bigger as you gain more basic land types. Other cards may provide various effects based on the number of basic land types, such as [[Karoo]] lands.
3. Aggressive Creatures: Pauper Domain Aggro decks typically include aggressive creatures that can apply pressure on your opponent. Cards like [[Kird Ape]], [[Wild Nacatl]], or efficient creatures with power/toughness relative to the number of basic land types can be quite effective.
4. Combat Tricks: You might include combat tricks like [[Giant Growth]] or instant-speed removal to protect your creatures or clear the way for attacks.
5. Sideboard: A well-constructed sideboard is essential to adapt to different matchups in the Pauper format. It should include cards that help you deal with a variety of threats and strategies especially color-specific hoser spells.
6. Card Advantage: Consider including cards that provide card advantage, such as Nylea’s Presence and Shadow Prophecy, for each basic land type among the lands you control.

You can check a recent Domain Aggro Pauper deck tech here on this video below.

Please note that the metagame and card availability in the Pauper format can change, so it’s important to keep up with the latest developments in the format and adjust your deck accordingly. Also, Pauper allows for a wide variety of strategies, so you can tailor your Domain Aggro deck to your personal playstyle and the metagame you’re encountering.