For the ETB effect, we borrowed an effect that premiered on We wanted the back face to be protective in flavor, but we didn't want it stalling out games, so we needed to give it an aggressive element
There are 4 rare (4.6%) and 2 mythic rare (0.8%) scene cards that can appear in these slots
Green also has lots of effects that care about creatures, including the best tutors like Worldly Tutor and Green Sun's Zenith and cards that benefit from having creatures like Rishkar's Expertise
The main thing here though, is stealing the best Creature from among those and just putting it into play
The best case is that you are ahead on mana, ahead on cards in your hand, and ahead on board presence while setting your opponent back
Whether youre attacking with a single powerful legendary creature or a board full of smaller units, positioning and timing are critical