The right choice depends entirely on your goals
(However, you can only use the stamped rare or mythic rare promo in your sealed deck, not these special Prerelease promos.) These Prerelease promos can be found in non-foil and traditional foil, as can their planar Booster Fun versions: Approximately two thirds of Prerelease Packs contain a non-foil Prerelease promo
In fact, if this were a list of overall usefulness, Geth would definitely be near the top
If the gift was promised, all permanents you control phase out, and until your next turn, your life total can't change and you gain protection from everything
When it comes to gifting treasure in 60-card formats, itll depend heavily on the format on whether its worth the squeeze or not, and to be honest, I feel like the fact we only got one card that gifted treasure to be a sign that Wizards have heard the feedback about rampant treasure ruining formats like Commander, and indeed some Limited formats, and decided to be more sparing with it.* [*As an aside, of the new treasure cards in BLB & BLC , were seeing multiple that make tapped treasures, which makes me happy.] GIFTING A CARD IN 1V1 FORMATS Now, heres where we get to the spicy part: gifting a card