Because blue isnt meant to have access to removal, and thats essentially what this is
There are also creature-lands like Lair of the Hydra that have an activated ability that animates them into creatures, and some planeswalkers, including Gideon-type walkers like Gideon, Ally of Zendikar and Kaito, Bane of Nightmares, that have activated abilities or triggered abilities that let them become creatures
A central question here, of course, is how TCG Pocket balances its worst instincts - its reliance on loot boxes, and all the patently compulsive effects they surface in its players - with a sense of health, balance and, crucially, actual intrinsic fun
I could not confidently tell you what is in the current version) but the downside is cognitive load
But sometimes you don't need the mana right away, and you'd rather get some sort of bonus from the land you grab