The Star Forge

As Long as The Star Forge is attached to a creature, The Star Forge can't be attacked and has "Whenever equipped creature deals combat damage during your turn, put that many loyalty counters on The Star Forge."

[ +1 ] : Attach The Star Forge to up to one target creature you control. Put a +1/+1 counter on that creature.

[ -5 ] : Draw Two Cards

[ -10 ] : Add ten mana of any one color