The defining feature is mana, not spells
That means that X number of Hidden Agenda cards can protect/help X number of creatures
In Unova, the Myth Arc is based around the legend of the Black Hero and White Hero representing Ideals and Truth respectively, their Pokmon companions Zekrom and Reshiram, the new "chosen ones" Ash (with Pikachu) and N, and Team Plasma attempting to use this legend to advance its plan for world domination
There, now thoroughly controlled by the miasma, he is ready and waiting for whatever sinister role he must play in awakening the Ultimate God
Thats especially powerful when you combine it with something like Maskwood Nexus, which makes all creatures you control, and creature cards you own that arent on the battlefield, all creature types
And what are some of your favorite low-power equipment