At the beginning of your upkeep, you may put a charge counter on Ather Vial.{T}: You may put a creature card with converted mana cost equal to the number of charge counters on Ather Vial from your hand onto the battlefield.
Modular 3 (This enters the battlefield with three +1/+1 counters on it. When it's put into a graveyard, you may put its +1/+1 counters on target artifact creature.)
Trample.Whenever another artifact enters the battlefield, put a +1/+1 counter on Arcbound Crusher.Modular 1 (This enters the battlefield with a +1/+1 counter on it. When it's put into a graveyard, you may put its +1/+1 counters on target artifact ...
Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) At the beginning of your upkeep, you may move a +1/+1 counter from target creature onto Arcbound Fiend.Modular 3 (This enters the battlefield with three +1/+1 ...
Haste.Modular 2 (This enters the battlefield with two +1/+1 counters on it. When it's put into a graveyard, you may put its +1/+1 counters on target artifact creature.)
First strike.Modular 4 (This enters the battlefield with four +1/+1 counters on it. When it's put into a graveyard, you may put its +1/+1 counters on target artifact creature.)