People look at the overpowered Power Nine, and see cards like Mox Pearl and Sol Ring as clear mistakes
Snapcaster Mage is too powerful to reprint in Standard, Mox Opal is a bizarre inclusion for an innovation product like Battlebond or Conspiracy, and judge promos are in too small a supply to affect prices
The Tabernacle ties up all your opponent's mana, assuming they have plenty of creatures out, forcing them to choose to either give up a bunch of their creatures in exchange for a spell or to keep as many of their creatures as they can at the expense of spending all their mana
The precon itself already offers some classic options, all of which are good enough to keep around if youre happy with them
Also, we can fuel the graveyard with things we want to later reanimatebut well have to be tricky and bait some strong noncreature card in that pile as well in order to force the opponent to bin that pile
In terms of in-game ability, this Tigger can gain one point of strength and one lore any time you play an action