Eon, Seer of All

Hidden agenda (Start the game with this conspiracy
face down in the command zone and secretly choose a
card name. You may turn this conspiracy face up any
time and reveal that name.)
Eeveelution creatures you control gain +1/+1 for
each eeveelution creature on the battlefield.
If every individual eeveelution is on the
battlefield, you win the game. (Variants of the
same eeveelution do not apply.)