Once more information becomes available I'll make sure to let you know, but until then at least we'll have the upcoming friend challenge system to keep us busy.
Here, since you have to tap to use it, and you only have 6 uses, I like it with haste in Red or equipment, untaps or haste like Thousand-Year Elixir and then after it's done, a blink effect like Momentary Blink
It also gives all of your creatures an ability that makes it so that they get +1/+1 counters on them whenever they activate a mana ability, equal to the amount of mana they created with that ability
Slogurk has a tendency to grow out of control if left to its own devices, which can make a Voltron kill quite viable
It was first introduced in the Plasma Freeze expansion
There are places where old players' cards also pay a lot