Foil Scion spiked to $50 at the end of last year in anticipation of the influx of dragons from Dragons of Tarkir and once more to $70 in the middle of March this year
Starting with the Aetherdrift set, they come in booster boxes of 30 packs (previously 36), which cost around 120-140 USD at launch and then usually stabilize around 100-110 USD
And if Birgi is already on the battlefield, casting Harnfel can assist in gaining board state advantage back
Elenda, the Dusk Rose ( Rivals of Ixalan ) Elenda, the Dusk Rose was always on the border of greatness until they changed the Commander dies trigger rules
Hitting two permanents and bringing them back immediately also opens this blue instant up to some shenanigans, like targeting Archaeomancer and Gilded Lotus which allows you to re-cast it infinitely
You move the stats around a bit and add in the ability to make a second 3/3 on the following turn and it's pretty clear how much of an upgrade this is