Super Tactical Droid

Each Droid creature you control have "{t} Add
one mana of any color to your mana pool."
Whenever a Droid creature ends the battlefield
under your control, you may draw a card.
Repair 3 (Whenever this creature dies, put 3 repair counters on it. At the beginning of your upkeep,
remove a repair counter. Whenever the last is
removed you may cast it from your graveyard until
end of turn.)