Deluge (8)
Tap all creatures without flying.
When Deluge of the Dead enters the battlefield, create two 2/2 black Zombie creature tokens.
: Exile target card from a graveyard. If it was a creature card, create a 2/2 black Zombie creature token.
All creatures get -1/-1 until end of turn. Creatures that are green and/or white get an additional -2/-2 until end of turn.
Look at the top X cards of your library, where X is the amount of mana spent to cast this spell. Put two of them into your hand and the rest on the bottom of your library in a random order.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Exile target instant or sorcery card from a graveyard. Copy that card three times. You may cast the copies without paying their mana costs. Exile Mnemonic Deluge.
: Tap target creature unless its controller pays .
Return each creature your opponents control with toughness X or less to its owner's hand, where X is the number of Islands you control.
Foretell (During your turn, you may pay and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)
As an additional cost to cast this spell, pay X life.
All creatures get -X/-X until end of turn.
Gatherer works better in the Companion app!