Riot Rules

Some cards of effects might not yet be clear in the CRD yet, but Riot keeps interacting with the community and answered some of our questions.

Cithria of Cloudfield & Wildclaw Shaman (Buffs as Game Objects)

If Cithria of Cloudfield has no buffs and Wildclaw Shaman is played, both triggers are simultaneous and the player can order them as they choose. Cithria of Cloudfield can first receive a buff, then Wildclaw Shaman can spend it to receive a buff and ready itself.
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The ability for buffs to be targeted is expected to be removed. Therefore, Wildclaw Shaman can spend any buff you control when it resolves.
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Fox-Fire Targets Becoming Illegal

If Fox Fire targets become illegal (through might increase), Fox Fire's controller can choose which targets to 'deselect' until the Might of the remaining targets equals or drops below 4
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Kog'Maw (Combat Resolution Steps)

Deathknell abilities like Kog'Maw's can create and resolve a chain during 627.1 resulting in the 4 damage being dealt before deciding a Conquer.
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Playing Hidden Non-Unit Cards in Response to Conquer Triggers

You cannot play a hidden card you control on a battlefield you no longer control.
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Nocturne, Horrifying on an Existing Chain

Nocturne can be played at the time the card would indicate. Nocturne would be paid for and "set aside" until the effect that allowed his trigger to occur finishes resolving.
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Sett Legend Ability

Rule 572.2. is incorrect and is due to be removed. Sett's Legend ability should only be a replacement effect, not a Triggered Ability. Replace the card text's "when" with "if".
This intercedes on any other process occurring.
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