Techadon Master

+7: Create a legendary token enchantment that says "{3}: Sacrifice an artifact. Return a different artifact or factory back to it's owner's hand."
-7: Destroy all counters. Gain life for each counter destroyed this way on the next turn. You may exile this card.
-10: All factory permanents or tokens and artifact permanents have regenerate {1} until your next turn. You may exile this card.