Often, cards or even entire archetypes that were once meta dominant in the TCG or OCG end up completely unplayable or rogue at best in Duel Links, due to the difference in game mechanics -- e.g
This simplicity is part of what makes PSA so collector-friendly and easy to trade
I think collecting the Pidgeot ex is a good play as they are only going to become more popular with players as new sets are released and new decks come to the fore
On instants and sorceries, void may replace the original effect with an instead clause
On top of that, it's a decent creature that has Flash
With multiple potential effects to choose from, with enough black mana Doomsday Confluence can build up your board, destroy your opponents board presence, and send their hands right to the grave, effectively locking them out of the game in one fell swoop