A friend of mine has this green/white deck that is intended to make big things with modular and draw lots of cards - he named it "Ball Of Flies". This is how I would build it myself.
Key pieces:
Yotian Dissident and Steel Overseer: This is what grows the creatures and makes the deck hum. An early-game aggro plan could involve one of these two consistently growing an Ornithopter or Arcbound Mouser. It also combos with Animation Module, providing as many Servos and counters as you can pay for.
Mindless Automaton: This is the primary place you want to dump the counters. You grow it mostly through Yotian Dissident and Steel Overseer, but can also benefit from modular boys and in a pinch can discard unwanted cards to grow too. You can draw a lot of cards off of one or two of these fellas. Searchable via Scrapyard Recombiner.
Rite of Harmony: A secondary draw option, you can draw lots of cards with cheap creatures like Ornithopter and Memnite
. The draw power can help you grow Mindless Automaton so you can discard n draw in a pinch.
Hangarback Walker: Another great place to dump counters, and you can search for it with Scrapyard Recombiner. You can also play it for X=0 to trigger cheap draws off Glimpse of Nature and Rite of Harmony if you wanted. If you play Rite of Harmony and then sacrifice the Walker with lots of counters on it, you get a lot of cards as well as a lot of thopters.
Scrapyard Recombiner: Not only is it modular and can sacrifice itself to move its counters around, but it can fetch constructs: that includes Mindless Automaton, Memnite
, Steel Overseer or Hangarback Walker. Whatever you need for the situation.
Glare of Subdual: This friend says he likes the idea of tapping stuff down, so Glare of Subdual acts as removal. It can go well with thopters from Hangarback Walker, servos from Animation Module, and makes Ornithopter and Memnite
additionally impactful.
Manabase: Thornglint Bridge and Darksteel Citadel are artifact lands that trigger Yotian Dissident and can be sacrificed with Scrapyard Recombiner when they have outlived their usefulness.