You can't cast an instant (or activate an ability as an instant) while casting a spell. Therefore, much like Lion's Eye Diamond, you can't activate the ability intending to use the mana to cast a spell from your hand.
Diamond Lion
Even though you can only activate this as an instant, it is still a mana ability. It doesn't use the stack and cannot be responded to.
This printing is one of 3 catalogued treatments from PRM — the lineup includes Foil and Nonfoil alongside the standard finish. Across our catalog the Rarix library tracks every variant in the same family so collectors can compare price, scarcity and demand inside a single lineage.
Card #91371 of *Magic Online Promos*, the promotional run that shipped alongside the October 2021 Magic Online release.
Card type: Artifact Creature — Cat, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters. Mana cost: {2} (2 converted).
Legal in Modern, Legacy, Vintage, and Commander.
EDHrec ranks this card #10,785 in Commander, putting it in the fringe-play tier of the format's playable pool.
Illustrated by Howard Lyon. Rarix catalogs 652 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Howard Lyon
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.




































