Lets highly speculate here. If there is some kind of "ancient stones"...
a) is it equipment, if yes, it is attachable to mages only? Will we see attachable equip for creatures or specific subtypes (Knights)?
or
b) is it a conjuration (warding stones, gravikor).
His officers carry
It sounds like a card that attaches to a creature. Either an enchantment, or a conjuration that attaches to creatures and gives them a buff, or causes an effect in their zone or nearby zones even.
So far the only attaching conjurations we've seen are negatives, but it's a natural design space to explore buffing attached conjurations which I will refer to as "gear" until we have an official name for them. They will have to be careful in designing gear since there is no dispel/dissolve to target overpowering gear. But if carefully designed, and mostly defensive in nature gear should be balance-able. They can't make equipment that attaches to creatures without rewriting significant parts of the rule book.
Now, would it be for every one or xxxx mage only and how much it will changes meta? And do we really need it?
I hope it is not restricted because I do think we need it. Or at least by providing a defense against teleport you will be turning on cards like strangle-vine and quicksand that are currently unplayable. And, if the teleport prevention card cannot protect the mage himself, teleport can still be the bunkerbuster it was designed to be, to prevent long turtly games.