Well, as previews have trickled out onto the scene, weve learned exactly what it is
I think with great design you could safely get up to about 25% lands in your cube if you so desired
It hoses mana bases, like dual lands, considerably
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: Level 2 Whenever you attack, target attacking creature gets +1/+0 and gains trample until end of turn
Given that these are borderless cards with new art and sometimes a second treatment that can be tailored to a new look and theme, expect WotC to continue inviting these to set releases and keep this amount within a reasonable range