The Aetherspark

Legendary Artifact Planeswalker — Equipment {4}

As long as The Aetherspark is attached to a creature, The Aetherspark can't be attacked and has "Whenever equipped creature deals combat damage during your turn, put that many loyalty counters on The Aetherspark." [+1]: Attach The Aetherspark 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.