Age Of Champions

Era (This enters the battlefield with an era counter for
each player. When the last era counter is removed from
it, sacrifice it. This has: "{3}: Remove an era counter
from this. Any player may activate this ability.")
All creatures are legendary, have haste and
vigilance and enter the battlefield with a +1/+1
counter.
The fate of the world hangs in the balance. Even one
brave soul can tip the scales.