If you use Rite of Replication on Reaper King they not only ETB, they'll all see each other doing it
Combined with the frankly outrageous state of things back then (4 Ancestral Recall , anyone?) leading to prolonged game states and impasses, WotC decided that enough was enough and restricted Ivory Tower
This is thanks to the sheer volume of draw it provides to mono-green
If youre playing against a deck thats designed to benefit from playing multiple spells in a term, making it easier for them to do it will generally disproportionately benefit them and not you
Expanding upon the design space of Edge of Eternities, this set should fit surprisingly nicely into Standard and beyond
A lifetime white mage, he has a strong affinity for the Orzhov and Boros colour combinations, as well as hatebear and midrange decks more generally