Soulherder does everything a flicker deck could want in terms of value
the card can summon a creature called the World Champion, whose power and toughness are equal to the opposing players life
The prices for these rare cards (and truly all Pokmon cards) are constantly shifting
Furthermore, first edition cards are marked on the bottom left of the card art with a neat little first edition tag, so you can always tell them apart from their modern equivalent
The ability to exchange one resource for another gives players plenty of choice on how best to use their creatures, lands, and spells to find winning combinations (more info on the theory behind that here)
(As long as this spell is on the stack, players cant cast spells or activate abilities that arent mana abilities.) Molten Disaster deals X damage to each creature without flying and each player