As a player you have a small pool of cards, typically this is either 45 as with Draft or 84 cards in a Sealed prerelease, and its your task to create a deck out of that pool
Scaling with the amount of Poison Counters on opponents, Phyrexian Swarmlord can create oodles of Phyrexian Insect Tokens
Smothering Tithe mixes taxing your opponents with Token generation, allowing for an explosive amount of mana generation in a color that is notorious for otherwise taking a while to get going
Take a look below at all the cards found in the Mythical Island pack, alongside their artwork and rarity
Notice how it just says "other card's effects", meaning it's not specific about what cards its unaffected by, just that it's unaffected by other card's effects in general
The box EV sits at roughly 8,617, which is above average for Pokemon TCG Enhanced Expansion Packs