10 of these are monarch cards that don't stack up well just fyi Eowyn, Shieldmaiden, Weathered Wayfarer, Denethor, Stone Seer, Humble Defector, Archivist of Gondor, Faramir, Steward of Gondor, Verge Rangers, Aragorn, King of Gondor, Boromir, Gondor's Hope, Palace Jailer, Eomer, King of Rohan, Champions of Minas Tirith, Heirloom Blade, Vanquisher's Banner, Herald's Horn, Court of Ire, Fealty to the Realm, Oath of Eorl, Forth Eorlingas
However, 3 mana to make two creatures unblockable for a turn is a significant ability
Beat your opponents & rank first at every battle
Not surprisingly, the card hasn't been reprinted since 1993 (the very first set of Magic's existence), although there was a Mystery Booster card printed in 2019 called Problematic Volcano which effectively serves as an homage to this card, and according to Ethan Fleischer, a mechanic that worked in a similar vein was experimented with for Theros: Beyond Death in 2020
Can't you say it's effectively a +3/3 or better enhancement enchantment
How Much are Pokemon GX Cards Worth