Mechanized Protector

Each time an artifact triggers it's ability, You may reveal an artifact creature in your hand:
Draw 1 card
Once each turn, if an artifact creature is
removed from the battlefield,
you may discard 1 card and if you do,
this card gains +2/+1 until the end of your
next turn.
{1}:Sacrifice an artifact-Add {c}{c} to your
mana pool.