Whenever Ragavan hits a player, you create a Treasure token and exile the top card of their library, letting you cast it that turn
If their strength is lower than their willpower, they take damage and damage counters equal to the strength value are placed on the card
Meanwhile, Invasion of New Phyrexia floods the board with knights, and you gain an emblem that permanently gives all your knights +1/+0 and ward 1 once it flips into Teferi Akosa of Zhalfir
A five-mana wipe that destroys artifacts and creatures is pretty reasonable, but you wont be caught flat-footed with this spell when youre in rebuild mode
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Having the ability to exile cards from an opponent's library, and then cast those cards for free on a later turn can be an easy way to completely shut down an opponent's deck