Q: While Macro Cosmos is active, can the first effect of Ritual Beast Ulti-Cannahawk be activated?
A: Even while Macro Cosmos is active, the first effect of Ritual Beast Ulti-Cannahawk can be activated. (Even while the effect of Macro Cosmos is applying, the targeted “Ritual Beast” cards are still returned to the Graveyard, and a “Ritual Beast” card can still be added from the Deck to the hand.)
Q: If the first effect of Ritual Beast Ulti-Cannahawk is activated by targeting 2 banished “Ritual Beast” cards, but either one of them is not banished when the effect resolves, will the effect still apply?
A: When resolving the first effect of Ritual Beast Ulti-Cannahawk, if either targeted “Ritual Beast” monster is no longer banished, the other one is still returned to the Graveyard, and a “Ritual Beast” card can still be added from the Deck to the hand. If both targeted “Ritual Beast” cards are no longer banished, then the effect to add a “Ritual Beast” card from the Deck to the hand cannot be applied.
Q: If the only “Ritual Beast” monsters I control are in face-down Defense Position, can I activate Ritual Beast Steeds? Also, if there are no “Ritual Beast” monsters in my Monster Zone, but I control a “Ritual Beast” monster in my Spell & Trap Zone as an Equip Card, can I activate Ritual Beast Steeds?
A: In both cases, you cannot activate Ritual Beast Steeds. You must control at least 1 “Ritual Beast” monster face-up in your Monster Zone.
Q: If I control only 1 “Ritual Beast” monster when I activate Ritual Beast Steeds, but then Compulsory Evacuation Device is chained so that I no longer control the “Ritual Beast” monster when Ritual Beast Steeds resolves, will its effect apply?
A: No, it will not apply in this case. (No monsters are destroyed.)
Q: If Skill Drain is activated, and I activate any Ritual Beast Ulti effect to de-fuse and special summon 1 “Ritual Beast Tamer” and 1 “Spiritual Beast” monster, is the effect negated?
A: No, returning to the extra deck for any of the Ritual Beast Ulti’s is a cost, where Skill Drain will no longer be negating the effects of said Ritual Beast Ulti because they’re no longer face-up on the field.
Q: During a turn in which the effect of Apelion the Spiritual Beast is being applied, if Ritual Beast Ulti-Apelio declares an attack, applying its effect that makes it unaffected by the effects of other cards, what happens with its ATK and DEF?
A: If the effect of Apelion the Spiritual Beast is being applied, the ATK of Ritual Beast Ulti-Apelio becomes 3100 and its DEF becomes 900, but if Ritual Beast Ulti-Apelio declares an attack, since its effect is applied, its ATK becomes 2600 and its DEF 400.
Furthermore, after the attack of Ritual Beast Ulti-Apelio is finished and gameplay returns to the Battle Step, since it is affected once again by the effect of Apelion the Spiritual Beast, its ATK returns to 3100 and its DEF returns to 900.
Q: Can Ritual Beast Ulti-Apelion/Cannahawk/Pettlephin be Special Summoned while Non-Fusion Area is applying?
A: The Special Summon of these monsters is not a Fusion Summon, therefore they can be Special Summoned even while Non-Fusion Area is applying.
More rulings can be found here.