In more recent times, cards like Kataki, War's Wage and Ancient Grudge have further suppressed Affinity's ability to perform at the highest levels
For the low, low cost of eight mana (thats not a low cost), you can basically win most games on the spot
Fetchability Triomes are attractive because they have basic land types (like Forest, Plains, or Island)
You also get a nice card storage box which comes in handy for storing bulk, and there's an Avatar-branded life click wheel included too
That said, it is 6/6 of stats to start with, and the tribal Anthem is frequently going to give us another +4/+4 or more worth of stats
The enter-or-attack ability is the real payoff, since paying and 2 life brings back a nonland permanent with mana value 3 or less from your graveyard