The problem with this is it is introducing needless complexity two keywords for two very similar mechanics would cause more confusion than simply writing the effect out in full on the card.
With either card on the battlefield, spells like Pyretic Ritual and Desperate Ritual cost just a single red mana, unlocking a massive mana boost
(2) When an opponents monster declares an attack: Destroy that attacking monster, and if you do, inflict damage to your opponent equal to half its ATK
cite web : CS1 maint: deprecated archival service (link) "CW March 17, 2012 schedule"
With an internal size of 71x97mm, they fit all standard-size cards up to 35pt thick perfect for Pokmon, Yu-Gi-Oh!, Magic: The Gathering, and other popular TCGs, as well as sports cards
NOTE: Again, please keep in mind that PEP is only immune to activated effects