Exiling Runehorn Hellkite from your graveyard is part of the cost of its activated ability. An opponent can't remove Runehorn Hellkite from your graveyard in response to you activating the ability.
08-11-2016
wotc
If a player has no cards in hand, that player discards no cards, then draws seven cards.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.
, Exile Runehorn Hellkite from your graveyard: Each player discards their hand, then draws seven cards.
Karl Kopinski2016-11-11
