Flash Rule 702.8 Glossary

A keyword ability that lets a player play a card any time they could cast an instant. See rule 702.8, “Flash.”
Flying Rule 702.9 Glossary

A keyword ability that restricts how a creature may be blocked. See rule 702.9, “Flying.”

Rulings (2)

November 17, 2017 Wizards of the Coast
If some of the creatures or players are illegal targets as Bogardan Hellkite's triggered ability tries to resolve, the original division of damage still applies and the damage that would have been dealt to the illegal targets is lost. It won't be dealt instead to a legal target.
November 17, 2017 Wizards of the Coast
You choose how many targets Bogardan Hellkite's triggered ability has and how the damage is divided as you put the ability onto the stack. Each target must receive at least 1 damage.

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