Both are part of the collecting experience I enjoy
In addition, most of our Eldrazi have huge stats so the 6 total power prerequisite on attack trigger, is super easy to trigger and we can often ramp a huge threat into the battlefield
Cards like Fiery Emancipation, Thousand-Year Storm, and Niv-Mizzet, Parun can drop away with a touch of burn, and Izzet stalwarts like Goblin Electromancer, other spellslinger cards like Archmage Emeritus, and then a suite of blue countermagic can amp up the attack
This means enemies can swiftly sweep if they get some quick beatdown Mons out, like a lucky string of hits from the new Eevee
Once you know what youre selling, the next question is where to sell it
(In this way its more akin to a Magic Online league than a tabletop booster draft)