Very nice. Excellent commander :) And indeed excellent in the 99 of a commander deck too.

I think 5 mana is probably the right cost - it certainly can't be less than 4. But 1/4 seems a bit disappointingly sized for 5 mana. So I might suggest pushing this to 2/4 or 2/5. But otherwise, awesome :)

(I too have a soft spot for Riku.)

This artwork is a great match for Riku of Two Reflections. Where's it from? (It's polite to credit the artist if you can.)

You are right on all counts! 2/5 seems as fine as 1/4, the body doesn't really matter and 2/5 is a unique size as far as legends go. :D

I also credited the artist, thanks for reminding me!

2 of these, or this and a clone go infinite. Is that intentional?

Hm, good point. It should perhaps say "non-Wizard permanent" or "permanent not named Riku, Sage of Simulacra".

The later goes infinite with Sakashima the Impostor, however I vote for that one, because that's just one infinite loop instead of like, 20.

There was templating issue where it just created a copy, not a token copy. Fixed that.

I didn't consider the Splinter Twin problem when I was sketching this out. I'mma think on it-- it's worth noting that Sharuum also goes infinite with any clone so it's not unprecedented.

The "permanent not named" solution could be good, I was also considering some variant of what Progenitor Mimic does.

Sharuum flickers infinitely with a clone, and therefore requires a 3rd piece to do anything. This creates infinite tokens with a clone.

Oh yeah, granted, but the point was the infinite thing. We also can make him a 0/7 and the "infinite with 2 cards" thing disappears since a combat step will no longer suffice to win a game with a clone. I'm still brewing on a neat solution to the Splinter Twin problem, leaning toward "not named" while I chew on the Progenitor Mimic idea I had.