Its ultimate can win games, and the animate land ability gives it some built-in protection
For example, if your opponent's life total can't change (perhaps because that player controls Platinum Emperion), you won't gain any life
Accessing both Red and Black card pools gives players an unprecedented arsenal of wide-board aggression, cost-reduction removal, and resilient character recursion
When you have access to the best mana ramp, tutors, and card draw effects in the game, it wont take long to build huge hydras like Hydroid Krasis, token generators like Empty the Pits, or powerful payoffs like Villainous Wealth, all of which can be doubled on the cheap via Unbound Flourishing and will be making huge attackers simply for casting these spells
One of the first things you should look for when grading Pokemon cards is how even or uneven the centering is