Anything you want to accomplish with Rionya can be attempted with Delina, Wild Mage too, but its much harder to pull off, given she makes a tapped and attacking creature, and given that creature will be exiled at the end of combat which will happen as you move to the next combat phase
Given that we all play with that one person at a Commander table that likes to target mana rocks, you often dont have to try that hard to get these things in your graveyard
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Umbris will be bigger each time you cast it, and you easily win via commander damage by making it unblockable, or by using infinite ETB engines to mill opponents out
Slows the game down, especially if youre one of the last two