I also run a Hallar deck, and I'm liking yours a lot. You have a lot of stuff that I don't.

Here are some suggestions that I've found useful:

• Forge of Heroes
• New Horizons
• Primeval Bounty
• Blessings of Nature
• Hunger of the Howlpack
• Overload
• Immaculate Magistrate
• Emblazoned Golem

In general, I've found that a good way to play Hallar is to focus on providing a lot of +1/+1 counters and then using a few cheap kicker spells to trigger Hallar. I tend to avoid most kickers that are expensive or that require multiple colored mana whenever possible. I also like to use something like Reclaim to get back a cheap kicker so I can potentially trigger Hallar twice in one turn.

I might recommend cutting out some of the more expensive cards, like:

• Keldon Overseer
• Wolfbriar Elemental
• Citanul Woodreaders
• Oran-Rief Recluse
• Territorial Allosaurus

Another fun way to play Hallar if you include a lot of cards that put +1/+1 counters on creatures is to include cards like:

• Falkenrath Exterminator
• Goblin Razerunners
• Kilnmouth Dragon
• Preyseizer Dragon

If you use cards like Hunger of the Howlpack and Blessings of Nature to dump counters on them, you can really do some damage with these. They also help to take some of the heat off of Hallar.