Some product lines offer higher quality or more features than others, but any of these products can help a player get their collection organized, and make the collection easier to store and transport, too
Compare that to Kess, Dissident Mage, who can only cast one instant/sorcery on your turn, or Dralnu, Lich Lord, who has to tap to give a spell flashback -- oh and that pesky drawback of straight-up dying if someone casts a Blasphemous Act
This would give players dueling experience without having to dive straight into the very difficult ranked duels
Some players may try to Cascade into Crashing Footfalls and the like, but even casting a basic Tarmogoyf or Lightning Bolt is well worth the mana
Using spot removal on Avenger will certainly slow down the death but having so many tokens left over is usually too much value for those kinds of decks to beat
A deck may not have more than 4 total copies of this and [P-010]