The Pokmons ability is what makes it so special
The need for two Energy types is both the highlight and the downfall of Dragonite, however, given that this makes the card difficult to build before your opponent has inevitably stacked their Mewtwo ex or Charizard ex with Energy
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He has two abilities: an Auto Ability that triggers when he is put into the Break Zone, and an Action Ability that activates when he is dulled and then put into the Break Zone
Once Derevi is on the battlefield, the common strategies involving it are either to go wide with a lot of evasive creatures to generate absurd amounts of mana from lands and mana rocks or to start tapping things down in tandem with Stax cards like Stasis and Winter Orb to create an incredibly tight stranglehold over the board
Since you have the infrastructure to hit already, why not add in two more combat damage triggers that also boost the power by two and thus the Commander Damage clock is sped up as well and giving two key protections from targeted removal like Beast Within and burn like sweeping Blasphemous Act