I'd say we're getting the whole cake today
Think about the creatures you can afford to reanimate (or hard cast) when designing your deck (and mana base), and also the additional utility of cards like Eureka, and how they could potentially interact with large creatures stuck in hand
(If this matters, you must have a very good reason for wanting to pay life.) If the target Equipment can't legally be attached to the target attacking creature when Raubahn's last ability resolves, the Equipment won't move
The card costs three ink to play (it can also be added to your inkwell), has three strength and three willpower, and will gain you two lore when it quests
Are you building a Five Color brew kitchen table deck from 60 cards to Commander to the Five Color format proper
Since you can make Tatsunari and Keimi unblockable, you can use the Keimi token to ninjitsu other creatures into play, while racking up commander damage with an enchantment-buffed Tatsunari