On the latest PTR a new card reward was released.
The cooldown is 15min and the object lasts only 10.
If you spawn it then stand on top for 10min it will disapear but you will be floating - like when you stand on a chest and loot it. But if you don't move for 5 more min you can spawn another - it spawns a bit higher than the previous one, jump up on to it and repeat till you acheive your goal height.
Altho time consuming it does work for now.
Here is a picture of me testing it out in the stormwind keep
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