Not only were they bad then, but Staff of the Ages does the same thing for all landwalking (even Desertwalking) and its an artifact too boot
Free 9/9s are good, especially when they have the abilities that Zacama does
All you need is a card like Heartstone or Zirda, the Dawnwaker to reduce the cost of Sliver Queens effect, then cards like Earthcraft or Gemhide Sliver + a haste enabler, and you have access to infinite 1/1s
While my version runs a lot of charms, like Abzan Charm to control the board in a Draw-Go style of play, I do run plenty of other high value multicolor spells like Guided Passage to draw cards and politic, Invasion of Alara for tremendous value, and Unite the Coalition which is a bonkers top-end
But your opponent can do the same on your turn
This year, seven cards are holo -- including Pikachu from 151