Throw in Merfolk related to drawing cards or playing lands (or both, like Tatyova, Benthic DruidTatyova, Benthic Druid), and you've got a nearly unstoppable tsunami of card advantage, land acceleration and an impressive army of Merfolk rushing up from the depths to consume your foes
It feels like a great balance, and that extends to the power level of the cards, too
But it was printed at a lower rarity than other commons and was just one/sheet
Of course, no army is complete without a competent general, so lets look at the best token commanders in Magic
As far as the effect, there are already plenty of cards that let you grab any land for 2-3 mana
The most important thing for us during development was the 'collection experience'