One episode dealt with a trainer who lost her Pokmon after her town was flooded, the Pokmon was in the Pok Ball for decades deep under the water
Meanwhile, Izzet Charm can still counter that planeswalker (admittedly in a much less efficient way since it costs twice as much as Spell Pierce does), but it can also kill the Dark Confidant and, when the other modes are dead, potentially improve your hand by looting away some extra lands, Faithless Lootingstyle
It would be on a tier with a secret rare or gold star depending on what kind of 1st ed card you nabbed randomly in your packs
Fires of Yavimaya Much has been said on this subject
Its not worth talking about Gates in too much detail, as theyre more of a returning mechanic
This heavily incentivizes not killing your creatures, which you can either force through blocking or sacrifice themes, the latter of which Id recommend