Here is my second Gods Unchained F2P Deck Guide, this time on Slayer War. You can check out my first guide on Zoo Nature here @meltysquid/gods-unchained-f2p-welcome-core. Leave a comment for the next decklist you want or any cards I should go over more.
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Slayer War is another easy God to start out with since it can be competitive on a budget. It is currently one of the best decks in the meta. This deck is the fastest deck in the game, great for finishing your weekend ranked games and Blessing of the Gods.
The deck is aggressive and tempo-based, the game plan is to win the board early with sticky creatures, blitz, and relics then transition to closing out the game with Slayer.
Sample Decks
Welcome
If you're are just starting out, here is a Welcome deck, an upgrade over the default starter deck. Check out gudecks for the card descriptions and other decklists. https://gudecks.com/decks/8972
Welcome and Core
Here's a sample decklist with only common and rare Welcome and Core cards, easily accessible to anyone starting out. https://gudecks.com/decks/5990
Budget Divine Order
Once you've won some weekend ranked reward Divine Order Packs, you can start building up to something like this. https://gudecks.com/decks/8977
Mulligan Guide
Going first you want to curve out with sticky creatures and establish board through good trades.
Going second you want reactive cards, blitz creatures, pingers, and relics to comeback from behind.
You can check out fakemews' video on how to play the deck. 
Welcome and Core Decklist Explanation:
- Wild Hog, Bladecaster, Skeleton Heavy, Shield Maiden, Raid Reveller: Sticky creatures
- Vanguard Axewoman, Tavern Brawler, Viking Longship: Blitz lets you make good trades
- Boil-Blood Outlaw: Early threat your opponent has to kill or gets big
- Shieldbearer: Buffs creature to trade up
- Athenian Archer: Ping lets you finish out 1hp creatures
- Trojan Battlemage: Twin strike and Protected lets you 2 for 1
- Vicious Rend, Blade of Styx: Can kill creatures early or go face to finish the game
- Over-proof Brew: Gives your creatures Protected and +2atk so you can trade up or finish off the opponent
Upgrades:
Core Epic & Legendary:
- Tartessian Improviser: Buffs a creature in hand, really good if it buffs a blitz creature
- Warmonger Smith: Sticky creature that buffs your relic for extra damage
- Redfume Serum: Requires less setup than Over-proof Brew
Cheap:
- Nokkvi Warrior: Kills 3hp creatures easy, use your creatures or Slayer to trigger frenzy
- Battle Artisan: Blessed is strong, some of the effects can swing the game, the relics you can get are a bonus
- Archangel Bruiser: 5atk and blitz lets you kill big creatures easily, overkill can clean up small creatures
- Another Round!: +3/+3 and handbuff means you opponent needs an answer quick or you'll snowball
Expensive:
- Valka's Captain: 3/2 that gives you a relic, relic is great for triggering frenzied or picking off creatures
- Thunder Caller: +1/+1 every turn when frenzied can snowball
- Oddi, Valka’s Herald: Even stickier raid reveller
- Leviathan Hunter: OOIM target, gives you a 1atk relic to pick off creatures or trigger frenzy
- Out of Its Misery (OOIM): Kill off your own creature and get a big buffed creature, buffed creatures early can win games on the spot if they can't answer it, make sure to have enough targets so its not a brick
- Swashbuckler: OOIM target, and can ping face
- Master Tactician: Sticky 2 drop, gives flank to go around frontline
- Pyramid Warden: Sticky 2 drop, great early board control
- Scythes of the Harvest: Tons of damage, can make trades or go face
Filler/Replacements:
Welcome and Core cards that can fill in for missing cards
- Trial Spirit, Deadly Arsenal: Buff creatures to trade up
- Reckoning: Draws a relic
- Dryder Sailweaver: Sticky creature
- Wiccan Trapper, Bronze Servant: Relic Removal
- Wicked Fae: Pinger
- Enduring Shield: gives your creatures protected, good value
- Hunt Warden, Wetlands Ogre: Vanilla curve fillers