Viktor, Machine Herald

+2: Deal 3 damage to up to 3 target creatures, then, put a -1/-1 counter on each of them.
-5: Put a creature card in your graveyard into play under your control, it has a -1/-1 counter and is now an artifact creature.
-7: You get an emblem with "All artifacts you control do not need to tap, and gain +1/+1 if they're artifact creatures."