If you can resolve a delve creature, most of their tiny creatures are just going to lose the fight unless they have one of their few answers
This is a good creature for a reanimation or self-mill deck thatll be filling your graveyard with resources to target with it
With Sun Titan, you can bring back your fetch lands for more ramp, you can bring back your Esper Sentinel, Mother of Runes, or Night of the White Orchid
These types of cards reimagine characters in a totally new light, sometimes at odds with their original design or personality
On top of that, his ability is great: Whenever you play a Floodborn character, each opponent chooses and discards a card
For just one green, one white, and one blue mana, you could web-sling in anything from a Progenitus to a Jodah to an Atraxa