I'm absolutely loving this list.
12 sources of early ramp plus you have the ability to cut some clunky cards and play a game winning shimmerpack quicker than ever before
there's a possibility splashing justice is correct for stand together in the market but as far as 2 faction shimmer goes I think this is solid
Sandstorm titan is there to slow the game down and nullify flying threats, and because I'm playing 4 I cut marisen down to two copies. Marisen is fine but besides the lethal it doesn't do anything unique. It feels like simultaneously the worst card and best card in the deck. You could also cut the sandstorm titans and run the new sandstorm scarf but the 5/6 endurance body is definitely relevant for stabilizing against aggro decks.