Arcbound

[Eternis]

Arcbound 80 cards, 0 sideboard 20 {Forest} 20 lands 4 {Darksteel Sentinel} 4 {Arcbound Crusher} 4 {Arcbound Lancer} 4 {Arcbound Overseer} 4 {Arcbound Worker} 4 {Arcbound Ravager} 24 creatures 4 {Everflowing Chalice} 4 {Energy Chamber} 4 {Argentum Armor} 4 {Doubling Chant} 4 {Prototype Portal} 4 {Darksteel Reactor} 4 {Doubling Cube} 4 {Strength of the Tajuru} 4 {Doubling Season} 36 other spells Sideboard Notes: Artefact primary

[Rass]

How about some artifact lands  {Vault of Whispers} and such or some affinity  {Myr Enforcer}

[Harukai]

I would try to mana accel this a little bit to take advantage of some of the things here  {Vedalken Engineer} and or  {Etherium Sculptor}.