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Derevi, Empyrial Tactician is the win condition specific to Najeela and can be used to tap down blockers in addition to its powerful untap ability to untap your mana sources and activate Najeela, the Blade-Blossoms ability to attack opponents to death with an exponentially scaling army

That does not instantly make it a playable card though, and needless to say, this has to be used in conjuction with other preparatory moves

You may cast this card from your graveyard by paying and exiling four other cards from your graveyard rather than paying its mana cost

Whenever Kalonian Hydra attacks, double the number of +1/+1 counters on each creature you control

The key interaction lies in warp: You can play this as a 2-mana card, then flicker it with cards like Ephemerate and Phelia, Exuberant Shepherd to get a 4/6 flier that drew two cards for a frankly unfair amount of mana