Both are made by third parties, but proxies do not attempt to resemble a genuine card
Alphabetical order under the cut
Mana, Rocks, and Lands Check out this pair of mana rocks
Using two removal spells to get rid of the big flier is annoying, but that you need to do this twice sounds pretty ambitious for a mid/low powered cube to me
To alleviate this issue, WotC has developed Through the Omenpaths , a digital-only series of sets that are "Universes Within versions of Universes Beyond sets that otherwise wouldn't be coming to digital Magic platforms." Some of the Universes Beyond Collaborations Won't Make It to MTG Arena There Were Issues Involving Digital Rights For Various Properties "These digital cards will be mechanically identical to their Universes Beyond tabletop counterparts but with unique creative treatments, different art, and different names," Rasmussen continues
In Zendikar Rising they were all lands on at least one side, while in Kaldheim they were used for the legendary creature Gods on one side and a different kind of permanent related to them on the other