Reanimating Iona with Yixlid Jailer in play

[Koby]

I was playing around on MTGO and found a strange interaction:

Yixlid Jailer is in play, nullifying all graveyard abilities.

Iona, Shield of Emeria is reanimated into play from the graveyard. There was no prompt to choose a color.

Is this how this interaction behaves? I'm not sure if it's a bug or how the rules actually work for "As ~ would come into play" abilities?

[cdr]

That's a bug; effects like Yixlid Jailer's specifically do not affect "As ~ would enter the battlefield" abilities.

614.12. Some replacement effects modify how a permanent enters the battlefield. (See rules 614.1c-d.) Such effects may come from the permanent itself if they affect only that permanent (as opposed to a general subset of permanents that includes it). They may also come from other sources. To determine which replacement effects apply and how they apply, check the characteristics of the permanent as it would exist on the battlefield, taking into account replacement effects that have already modified how it enters the battlefield, continuous effects generated by the resolution of spells or abilities that changed the permanent's characteristics on the stack (see rule 400.7a), and continuous effects from the permanent's own static abilities, but ignoring continuous effects from any other source that would affect it.

Example: Voice of All says "As Voice of All enters the battlefield, choose a color" and "Voice of All has protection from the chosen color." An effect creates a token that's a copy of Voice of All. As that token is put onto the battlefield, its controller chooses a color for it.

Example: Yixlid Jailer says "Cards in graveyards have no abilities." Scarwood Treefolk says "Scarwood Treefolk enters the battlefield tapped." A Scarwood Treefolk that's put onto the battlefield from a graveyard enters the battlefield tapped.

Example: Orb of Dreams is an artifact that says "Permanents enter the battlefield tapped." It won't affect itself, so Orb of Dreams enters the battlefield untapped.