I would suggest completing playset of
blooming marsh regardless of other changes. I would also suggest upping the land count to 22/23. If you can get them,
Hissing Quagmire is another good land.
Two ways to take this. Either heavier on energy, ore more +1/+1 counters.
For Energy,
Greenbelt Rampager is a great one drop.
Longtusk Cub is perfect for the deck in energy as it is both energy and +1/+1 counters. I would cut
Armorcraft Judge and probably move
Tireless Tracker to the sideboard. Even in an energy build, I'm not sure about
Servant of the Conduit. I don't think you need to be running ramp creatures. Complete your playset of
Aether Hub.
If you want to go harder on the counters, I would include
Narnam Renegade or
Gnarlwood Dryad as a one drop. Both strong Deathtouch creatures. I would also add more tireless trackers. Swap in
Traverse the Ulvenwald in place of
attune with aether. I'm a fan of
Scrounging Bandar, as with
Winding Constrictor out, the counter share ability means that the number of counters increase. Expensive upgrades could include
Walking Ballista (amazing card, $12 is steep though), or
Grim Flayer, in which case consider making it heavier on delirium, by including cards like
Implement of Ferocity as an additional artifact. If you do this, I'd get rid of any cards which include energy.
For the sideboard, I include
Lost Legacy vs Saheeli Combo,
Scrapheap Scrounger or
Tireless Tracker vs Control,
Lifecrafter's Bestiary for grindy matches.
Blossoming Defense is good (I even mainboard it sometimes), as is some form or artifact/enchantment removal, and
Yahenni's Expertise.
Ruinous Path is also probably better than
Murder. I also include
Ishkanah, Grafwidow in a more delirium oriented build, as it is great against fliers and tokens.
I might see if I can fit Drana into my build as it looks like a cool addition.