Tribute to Solemnity

At the beginning of your upkeep, put a charge
counter on Tribute to Solemnity.
Nonartifact spells cost {x} more to cast, where X
is the number of charge counters on Tribute to
Solemnity.
Remove X charge counters from Tribute to
Solemnity: Artifact spells cost {x} less to cost
until the end of its controller's next turn. Any
player may activate this ability.