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3U: discard Otawara, Soaring City: Return target artifact, creature, enchantment, or planeswalker to its owner’s hand. This ability costs {1} less to activate for each legendary creature you control. The ability counts only creatures but not planeswalkers, so you should pay 3U.

"If a black or red permanent, spell, or card not on the battlefield would be put into a graveyard, exile it instead." Well, the rule cares about if that item is going into a graveyard, but not how the item goes into the graveyard. Sacrifice still makes Bloodghost put into a graveyard, so the...

It's probably a bug rather than a ruling issue. From MTG judge: https://blogs.magicjudges.org/ftw/returning-mechanics-review/convoke-delve-and-improvise/ "Because these are alternative ways to pay mana, they act on the final cost, after it’s locked in and after the player has activated mana...