Because of its wording, Rhystic Study s power is massively amplified in Commander since each opponent will have to contend with it
Youre going to have way more Merfolk players playing this than red players playing Magus of the Moon, and itll do a lot of heavy lifting in Merfolk decks, enabling Islandwalk and disrupting opponents
You can now : Place one card into your inkwell , spend ink on any abilities , exert any abilities , spend ink to summon characters or send characters to quest (instantly gaining lore)
While he's not seeing play in the format yet (beyond streamer AspiringSpike experimenting with him in MTGO), we wouldn't be surprised if he is at least playable, if not quite a staple
The math on cards like Flare of Duplication and Eldritch Evolution totally changes when you have access to something like this at all times
Its hard to think that a player wont win a game after having two additional combat steps