Its actually quite simple, and all you need is to grow Korvold by simply sacrificing some tokens and making it unblockable for a single lethal attack
That impacts the price, historically, as the only folks who want this card want to build around it, instead of adding it to others
If you search for cat creature types, youll get a lot of humanoid catfolk cats like [c]Cat Warrior[/c]s
In addition to costing an extra mana to tap, it also only checks the field for basic Swamps you control, meaning it wont count Blood Crypt, Watery Grave, or any other nonbasic with the swamp subtype
As an additional cost to cast green permanent spells, you may pay 2 life
Were all just trying to find the OP cards and hidden gems that we can build new decks around, or that can take our existing decks to another level whenever a new set is released