Nah.
6 mana is still too heavy for nowadays.
Not saying it’s bad just that there is better stuff.
For example:
Elemental decks have more board presence and minion pressure Power than the average mage deck.
Also they can duplicate molten rune and elemental aspiration leading to a deck with a diverse variety of Win conditions.
We have celestial projectionist too where some of the dumbest combos with it will happen in secret mage.
People fearing an OTK meta coming from mage decks really should just chill a little.
It will be really faster than Sif decks.