N Rush [Rank 5 to Godrank] Season 20
Went from rank 5 to godrank with this deck pretty smoothly for the most part.
For mulligan, try to have at least 1 maceman, war yak or queen's guard in hand. You may keep the rest of your hand as assist and/or follow up for your opening creature. Rebel slinger isn't much of fighter and is better to have it later in the game to push for the remaining damage in general, so throw it away in mulligan, unless you want to swarm early game with unlikely hero and rangers.
For lands, you push up mid and drop creatures when appropriate. Don't hesitate to block other rush decks with a land or 2, especially if you already have a creature that can walk on opponent's lands since we can usually get our desired spots the turn after.
Punishment is a tech card vs R rush's neutral creatures, so you may replace it with a 3rd rebel slinger (or maybe even a freedom fighter).