I remember at first we thought XY era sets simply werent printed in unlimited edition, but a few years later they could be found after all
But if you play the newer Etali, your opponents need a counterspell
One possible reason (the most popular theory) is that ante meant that playing too many cards in your deck would mean risk of a high value loss
It would also fail to take into account the card and mana cost of the Lab Maniac
Most importantly, the rest of your cards won't be impacted, and you're unlikely to play two dragons on the same turn, which would something like Worn Powerstone better
Creatures (8) 1 Verdant Force 1 Visara the Dreadful 1 Symbiotic Wurm 1 Stronghold Taskmaster 1 Nether Spirit 1 Petradon 2 Faceless Butcher Lands (23) Spells (28) Sideboard Entomb is frequently better than a one-mana Demonic Tutor, since finding the creature you want is only half the battle