What are you talking about? There are 1- & 2-cmc colored legendary creatures legal in standard right now, so this can procude if build around in standard in the 2nd turn mana reliably.
I really doubt that this Mox will see as much play as any other (not banned) Mox across formats though...
But who knows, maybe someday there will be a competitive legendary deck in any eternal format utilizing this, I guess only time will tell.
|Mono U Reservoir||#MTGO||MTGO Standard MOCS||24.09.2018|
|Reservoir||#MTGO||MTGO Standard PTQ||16.09.2018|
|Mono Blue Reservoir||#MTGO||MTGO Competitive Standard League||13.09.2018|
|Mono Blue||#8||Swiss Magic Masters 2018 @ Interlaken||02.09.2018|