Myr Welder

Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)

Metalcraft — This creature gets +2/+2 as long as you control three or more artifacts.

Put target artifact, creature, or enchantment on top of its owner's library.

Put a -1/-1 counter on each attacking creature.

Destroy target artifact. You gain life equal to its mana value.

Put any number of target artifact cards from your graveyard on top of your library. Draw a card.

Sacrifice this creature: Put a -1/-1 counter on target creature. Then if that creature's toughness is 1 or greater, regenerate it.

Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.) Whenever this creature attacks, create two 1/1 white Soldier creature tokens that are tapped and attacking.