Sometimes that effect can be underwhelming because you simply dont have something to put into play, but with all the cards Eshki draws you, I dont foresee that being a major problem
Well cover both shells below
Unfortunately, there has been no indication that any cards no longer available will return to the game nor that they can be traded but for posteritys sake, heres every promo card in the Promo A series
(Food is an artifact with ", , Sacrifice this token: You gain 3 life." Treasure is an artifact with ", Sacrifice this token: Add one mana of any color.") Creature - Elf Scout Ramp (CTRL to add secondary) Recursion Wrenn and Six +1: Return up to one target land card from your graveyard to your hand
My best guess was that development felt that most people incorrectly played a flicker effect on a creature you controlled but didn't own (for example, something you've stolen with an effect) and this change was to make the effect work the way most people thought it did
Thats called Jund baby