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Even at uncommon, it would have worked better as an ETB permanent with a lower casting cost, or a higher one but generating two tokens

For the impressively low cost of two blue mana, Master of the Pearl Trident is a creature that provides all other merfolk you control with +1/+1 and Island walk

Also, since the overall power level of Modern is dramatically lower compared to Legacy and Vintage, the 2 for 1 for countering a medium-power non creature spell is often not worth it

Dragonstorm Globe

Incubate creates a token with a set number of +1/+1 counters that you can turn into a phyrexian creature for two colourless mana