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Biosynthic Burst

This is one of those decks where I would not feel ashamed playing Fireball, Comet Storm, or Banefire, because I know that the X cost in those spells can be enormous with the right board state

For example , the ultimate effect of Planeswalker Nicol Bolas is similar to this, and in Duel Decks, this card is included in Bolas' deck, and in DotP 2013 , Nicol Bolas also uses this when he appears as the final boss

It also encourages creatures to block, which might keep the board less gummed up

There isnt a specific Toxic Deluge -X/-X effect in Standard right now, so it might align very well with the formats answers