Being able to target artifacts and lands is a welcome bonus compared to many other flicker cards
Floodborn cards in particular present characters in such exciting new ways that those familiar with their original properties will really enjoy the spin on a well-known archetype
Maybe Arena of the Ancients being a 30-year-old card that cares about legendary creatures was enough to catch their attention
Goobbue Gardener There should be enough to do with your mana for Goobbue Gardener to be pretty useful
Ramp is a very deep well, but I define ramp spells as typically sorceries and instants that put at least one land onto your battlefield from your library
Most often, they are low-power, high-toughness creatures, which means that without some extra support, they are usually good at blocking (and making mana, for some reason) but aren't very good at actually killing the opponent