Choose one — • You draw five cards and you lose 5 life. • Create an X/X black Demon creature token with flying, where X is the number of cards in your hand. Entwine {4}
{2}{U}, {T}: Put target creature on the bottom of its owner's library. That creature's controller reveals cards from the top of their library until they reveal a creature card. The player puts that card onto the battlefield and the rest on the bottom of their library in any order. Activate only as a sorcery.
{U}: Quicksilver Elemental gains all activated abilities of target creature until end of turn. You may spend blue mana as though it were mana of any color to pay the activation costs of Quicksilver Elemental's abilities.
At the beginning of each player's upkeep, that player puts a flood counter on target non-Island land they control of their choice. That land is an Island for as long as it has a flood counter on it. At the beginning of each end step, if all lands on the battlefield are Islands, remove all flood counters from them.
Flying When Reiver Demon enters the battlefield, if you cast it from your hand, destroy all nonartifact, nonblack creatures. They can't be regenerated.