This card provides absurdly good ramp, giving its owner three mana for free - which allows for a terribly strong early game, or insanely broken combos
All of the quick expansion cards I listed are available for about $2 at most, so you dont even need to break the bank to get started
What is the cheapest way to start collecting physical Japanese Pokemon cards
Couple this with the ablity to move all damage and potentially send a character to the discard pile, and it's easy to see why it's so valuable
Destroy each artifact, creature, and enchantment with mana value less than or equal to the amount of paid this way
As well as that, because of the fact that these two cards share the same name, an effect which would remove the highest Stage Evolution card from a Pokmon would, in this example, force the removal of both Honchkrow cards, leaving only Murkrow