Not bad as idea... you could just make a new effect:
Tempus fugit x: (y time quanta) The target player draws x cards.
x and y are numbers ofc
Originally, I envisioned this card as 'colorless/universal', along with quantum towers, dirks, long swords, etc.
That way, it's available to everyone and not immediately pigeon-holed into one or two deck types.
Ultimately, you would fear/prepare/anticipate this card from
any deck - not just when you see X or Y mark from your opponent.
It seems that a permanent is the way to go, like:
"Crystal Ball"
CARD COST: 10? (any color)
EFFECT COST: 8? (any color)
EFFECT: Player and Opponent each draw one extra card in their next draw phase.