There are a host of cards like Pit Automaton that provide mana only for use with activated abilities, for which Bobbleheads are a fine choice
The thing is that this list is full of cards like Reciprocate and Righteous Blow which are just as hard to have active as Harm's Way
There are so many of them Advisors arent the most exciting creature type, and a two-mana 1/3 isnt the most exciting array of stats, but this blue creature will absolutely ruin any opponents that cant deal with it
Creature - Human Soldier Good Stuff (CTRL to add secondary) Gooder Gifts Illusions of Grandeur Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) When this enchantment enters, you gain 20 life
The normal Secret Lair cards arent signed, but the signed Magic: The Baseballing planeswalkers appear as the bonus card in a small percentage of packages