If your deck is low curve (lots of 1-2 drops, average mana value is low) You can trim ramp
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More mana will equal more creatures, and the onslaught could reach truly overwhelming proportions with the inclusion of Standard all-star Experimental Frenzy
I could list every new card I love - like Alice, Growing Girl, who lends the Support keyword to your other characters and gains four lore when you reach ten strength, or Sisu, Divine Water Dragon, who allows you to draw a new card every time you quest - but in general all of the new cards in Rise of the Floodborn feel like a shift in power and ability
I could also see these abilities just being enough to hang in a lot of Peasant Cubes, and realistically, this card would be kind of busted if it only cost two mana to cast it upfront