This means that if the player is up against an immensely powerful ex Pokmon that requires a lot of energy, there is a chance for Exeggutor to deal enough damage to knock it out in one hit if the attack is used at the right time
Oftentimes this is a gradient more than a binary, but this gradient is often pushed to its two extremes with Partner decks
It costs just 1 mana, and you can play it in sacrifice decks that abuse ETB or death triggers
Especially ones that play Crucible of Worlds effects
But in a meta game with good enchantments to destroy like Wedding Announcement, enchantment creatures, and sagas, it suddenly becomes a worthy consideration
Some uncommons, like Risen Reef, are pretty troublesome to deal with