The process works the same as the London Mulligan, but your first one is free
At the start of Commander Draft, you'll open one of three boosters and draft two cards per pick, similar to Pick-Two Draft
card from your deck and immediately set it as Active
This one-direction value train is why Yuriko is a really powerful Commander, and a good mix between fun and deadly
Not sure if it's Secret Rare-levels of good compared to the standard Imperialdramon as a Super Rare since it doesn't seem *that* much better then it, but it's Piercing effect makes sense with the Wormmon line from this set and just Green in general
For example, if an opponent controls Blood Moon, an enchantment which says Nonbasic lands are Mountains, and you play Rootpath Purifier, Blood Moon can no longer apply to the lands you control because they are all basic