(Source: Cardmarket 27.06.2025 ) As an example: A CE Counterspell is worth around 45 whereas the first non-legal Counterspell for OS (Ice Age) would be only 1
While you need burden counters on The One Ring to actually draw a card, which technically is a restriction, tapping it puts a counter on it before you draw, so unless theres something like a Solemnity out, there is no restriction here
In particular, the centering on modern cards is atrocious
Unless destroyed, this card will spawn a Phyrexian Mite every turn at the start of your upkeep, giving you more power to fight with
If the exerted creature is no longer on the battlefield or the Equipment can't legally be attached to that creature, that Equipment will enter the battlefield unattached
That's not to say Mortify's unplayable, just that there are cheaper ways to accomplish what this is doing, despite its flexibility