[Ronin]

I like both those clarifications, personally. Should be a 'may' because he can't always do it, and I like clarifying when a figure never makes it onto the battlefield in the first place ("at the start of the game" is a bit ambiguous and sometimes means after figures are already in the SZ).

Last sentence is the easiest place to trim words. Could take it all the way down to "When the Host is destroyed, immediately replace the Host with Mister Mind."