In the rare case where more than one card is exiled with Ugin's Labyrinth's imprint ability (likely because the triggered ability was copied or the ability triggered a second time), its last ability will return all such cards to their owners' hands
I expect this cards value to hold up VERY well overtime, and it will likely overtake many of the other cards on this list (yeah, Im talking about you, full art trainer Miriam)
Rather than being a dead card, this will swell in size by a pair of +1/+1 counters for each opponent who cannot discard
If this spells additional cost was paid, instead shuffle your graveyard into your library, draw seven cards, and you have no maximum hand size for the rest of the game
Picking up from where the Pre-Modern foils left off, the current most popular foiling process has run from Eighth Edition to now