They are more flexible than Treasure Cruise, are awesome in Simic Ramp with Cultivate stuff from Green or Izzet Spellslinger with Treasure makers for things like Guttersnipe or Dimir with Coffers and Urborg or with mono-Blue Nykthos, Shrine to Nyx
A hybrid of Monster and Spell, they can either be summoned conventionally, or "activated" in the newly added Pendulum Zones as Spell Cards, with their own separate effect
Honorable Mention: Bounce Bounce spells are effects like Unsummon that return the target permanent to its owners hand
I think for me the worst bit about this card is his left hand
These products also vary greatly in price, with some being entry-level products for new players to deluxe items for dedicated players
Suffice to say, the variants are at their best when the character is reinvented in a wondrous and unexpected way, as opposed to being given a palette swap